CN111272230B - Intelligent precious stone specimen parameter measuring device and method - Google Patents
Intelligent precious stone specimen parameter measuring device and method Download PDFInfo
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- CN111272230B CN111272230B CN202010259078.0A CN202010259078A CN111272230B CN 111272230 B CN111272230 B CN 111272230B CN 202010259078 A CN202010259078 A CN 202010259078A CN 111272230 B CN111272230 B CN 111272230B
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- 239000010437 gem Substances 0.000 title claims abstract description 113
- 229910001751 gemstone Inorganic materials 0.000 title claims abstract description 110
- 238000000034 method Methods 0.000 title claims description 9
- 238000005303 weighing Methods 0.000 claims abstract description 47
- 238000005259 measurement Methods 0.000 claims abstract description 33
- 239000007788 liquid Substances 0.000 claims abstract description 14
- 238000001739 density measurement Methods 0.000 claims abstract description 9
- 238000000691 measurement method Methods 0.000 claims description 7
- 230000001788 irregular Effects 0.000 claims description 4
- 238000003708 edge detection Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000033764 rhythmic process Effects 0.000 abstract description 2
- 238000004364 calculation method Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 239000003086 colorant Substances 0.000 description 4
- 239000010977 jade Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000012153 distilled water Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 231100000289 photo-effect Toxicity 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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- General Physics & Mathematics (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses an intelligent precious stone specimen parameter measuring device which can automatically measure multiple parameters of a precious stone specimen, has high measuring efficiency and small error, and can adapt to the rhythm of rapid update and sharing of parameters of a new specimen. Specifically, the device comprises a workbench, and a shooting unit, a size, a contour measuring unit and a density measuring unit which are sequentially arranged on the workbench. The shooting unit comprises a high-definition camera and two symmetrically arranged top light sources. The size measurement unit comprises a first weighing balance, a telecentric parallel light source arranged on the first weighing balance, and a CCD industrial camera which is arranged above the telecentric parallel light source and is coaxial with the telecentric parallel light source, wherein a telecentric lens coaxial with the CCD industrial camera is arranged on the CCD industrial camera. The density measurement unit comprises a second weighing balance and a '匚' type bracket arranged on the second weighing balance. A basket is hung on the 匚 bracket, and a container containing liquid medium is arranged below the basket.
Description
Technical Field
The invention relates to the technical field of parameter measurement of precious stones, in particular to an intelligent precious stone sample parameter measurement device and method.
Background
The existing precious stone sample resource sharing is not good enough, and particularly, characteristic precious stone sample pictures and spectral characteristic information (such as weight, size, density, shape and other characteristics and the like) applied to the education industry basically have no shared information.
An important factor that resource information of the precious jade specimen can not be shared is that the existing precious jade specimen is basically measured manually, a large error exists in a manual measurement result, and the consistency and the reliability of measured parameters are low. Moreover, the efficiency of manual measurement is low, the time for measuring each parameter of the specimen is long, the efficiency is low, and new specimen parameters cannot be updated and shared in time.
Disclosure of Invention
Aiming at the problems existing in the prior art, the main purpose of the invention is to provide an intelligent precious stone specimen parameter measuring device which can realize automatic measurement of multiple parameters of a precious stone specimen, has high measuring efficiency and small error, and can adapt to the rhythm of rapid update and sharing of the parameters of a new specimen.
In order to achieve the above purpose, the intelligent precious stone specimen parameter measuring device provided by the invention comprises a workbench, and a shooting unit, a size measuring unit and a density measuring unit which are sequentially arranged on the workbench, wherein the workbench is provided with a first measuring station, a second measuring station and a third measuring station which are in one-to-one correspondence with the shooting unit, the size measuring unit and the density measuring unit;
The shooting unit comprises a high-definition camera arranged right above the first measuring station and top light sources symmetrically arranged on two sides of the high-definition camera, and the light emergent surface of each top light source faces the first measuring station;
The size measurement unit comprises a first weighing balance arranged at a second measurement station and a telecentric parallel light source arranged on the first weighing balance, wherein a bearing area is arranged on the light emitting surface of the telecentric parallel light source, a CCD industrial camera is arranged above the bearing area, and a telecentric lens which is opposite to the bearing area of the telecentric parallel light source is arranged at the lens end of the CCD industrial camera;
The density measurement unit comprises a second weighing balance arranged at a third measurement station and a '匚' type bracket arranged on the second weighing balance, a hanging basket is hung on the '匚' type bracket, a screen is arranged at the lower end of the hanging basket, and when density is measured, precious stones are placed in the screen; a container filled with liquid medium is arranged below the hanging basket, and the sieve is positioned in the liquid medium of the container.
Preferably, the output ends of the high-definition camera, the CCD industrial camera, the first weighing balance and the second weighing balance are all connected with a computer terminal.
Preferably, the first measuring station is provided with a placement groove, and a carrying plate is detachably arranged in the placement groove.
Preferably, a plurality of side plates are arranged on the workbench to form a mounting cavity, a cavity opening of the mounting cavity is provided with a cover plate for sealing the mounting cavity, and the first weighing balance and the second weighing balance are arranged in the mounting cavity; the lower end of the telecentric parallel light source traverses the cover plate and is connected to the first weighing balance; the second weighing balance is provided with a T-shaped round platform, the bottom of the T-shaped round platform is fixed on the second weighing balance, the top of the T-shaped round platform penetrates through the cover plate, and the bottom of the 匚 -shaped support is fixed at the top of the T-shaped round platform.
Preferably, the bottom of the workbench is provided with a plurality of adjustable foot cups.
The invention also provides an intelligent precious stone specimen parameter measurement method, which comprises the following steps:
Step S1, shape measurement, specifically:
S11, acquiring a gemstone sample image through a CCD industrial camera, converting gray values of the acquired image, and calculating the edge contour of the gemstone sample in the image through an edge detection algorithm;
step S12, matching the obtained edge contour with a pre-stored precious stone shape template, and taking the shape template with the highest matching degree as the contour shape of the precious stone sample;
step S2, size measurement, specifically:
step S21, calculating the maximum inscribed circle, the minimum circumscribed circle and the minimum circumscribed rectangle of the outline shape through an image processing algorithm;
Step S21, according to the type of the outline shape of the gemstone sample, if the outline shape is circular arc type or biased circular arc type, taking the diameter R1 of the largest inscribed circle as the width of the gemstone sample and taking the diameter R2 of the smallest inscribed circle as the length of the gemstone sample;
if the outline shape is rectangular or biased rectangular, the length and width dimensions of the minimum circumscribed rectangle are used as the length and width dimensions of the gemstone sample;
step S3, density measurement, specifically:
Step S31, measuring the weight of the precious stone sample in the air through a first weighing balance, and marking as m 1;
Step S32, measuring the weight of the precious stone sample in the liquid medium through a second weighing balance, and marking as m 2;
step S33, according to the density measurement formula Where ρ 1 is the density of the gemstone sample and ρ 2 is the density of the liquid medium.
Preferably, in the step S12, when the obtained edge contour is matched with the pre-stored gemstone shape template, if the maximum value of the matching degree of all the shape templates is less than 60%, the matching is regarded as failed, and the contour shape of the gemstone sample is regarded as an irregular shape type.
Preferably, in the step S21, if the matching degree of the outline shape of the gemstone sample and the circular arc shape template is higher than or equal to the matching degree of the outline shape of the gemstone sample and the rectangular shape template, the outline shape of the gemstone sample is considered to be biased towards the circular arc shape; otherwise, if the matching degree of the outline shape of the gemstone sample and the rectangular shape template is higher than or equal to the matching degree of the outline shape of the gemstone sample and the circular arc shape template, the outline shape of the gemstone sample is considered to be biased towards the rectangular shape.
The intelligent precious stone sample parameter measuring device provided by the technical scheme of the invention can automatically measure the weight, shape, size, density and other parameter values of the precious stone sample, and simultaneously obtain the effect picture of the precious stone sample, thereby greatly improving the efficiency of precious stone parameter measurement. All measured parameter values are obtained by calculation based on an image processing algorithm, so that the relative error is small, and the problems of poor consistency and low reliability of manual measurement are effectively avoided; meanwhile, each measured parameter can be directly transmitted to the computer terminal, and is directly uploaded to the system after being processed by the computer terminal, so that the efficiency of parameter sharing is effectively improved.
Drawings
FIG. 1 is a schematic view of an intelligent gemstone sample parameter measuring apparatus according to an embodiment of the present invention;
FIG. 2 is an internal schematic view of an embodiment of the intelligent gemstone sample parameter measuring device of the present invention;
in the reference numerals:
100-working table, 110-side plate, 120-cover plate, 130-foot cup, 141, 142-support;
210-high definition cameras, 220-side light sources and 230-object carrying plates;
310-a first weighing balance, 320-a telecentric parallel light source, 330-a CCD industrial camera, 331-a telecentric lens;
410-a second weighing balance, 420- 匚' type supports, 430-a hanging basket, a sieve-431,440 container and 441-a bracket.
Detailed Description
The following description of the embodiments of the present invention will be given in detail with reference to the accompanying drawings, and it is apparent that the embodiments described are only some, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1 of the specification, an embodiment of the present invention provides an intelligent gemstone sample parameter measuring device, which includes a workbench 100, and a first measuring station, a second measuring station and a third measuring station are sequentially disposed on the workbench 100 from left to right. And a photographing unit is arranged on the first measuring station and used for collecting the appearance effect image of the gemstone sample. The second measuring station is provided with a dimension measuring unit for measuring the shape and dimension of the gemstone sample. And the third measuring station is provided with a density measuring unit for measuring the density of the gemstone sample.
The photographing unit comprises a high-definition camera 210 and two top light sources 220, wherein the high-definition camera 210 is positioned right above the first measuring station and is fixed on a support 141 vertically arranged on the workbench 100. The high-definition camera 210 is also connected with a computer terminal, and can directly upload the collected gemstone image to the computer terminal for storage. Two top light sources 220 are distributed on the peripheral side of the high-definition camera 210, wherein one top light source 220 is fixed on the support, and the other top light source 220 is fixed on the side opposite to the top light source 220 through a U-shaped lamp post. The light emitting surfaces of the two top light sources 220 face the photographing area of the first measuring station, and when photographing, the brightness of the two top light sources 220 can be respectively adjusted to achieve an effect similar to that of a shadowless lamp, so that the photographed appearance picture of the precious stone sample achieves a more effect.
The size measurement unit includes a first weigh scale 310, a telecentric parallel light source 320, and a CCD industrial camera 330. The first weighing balance 310 is horizontally arranged on the second measuring station, the telecentric parallel light source 320 is vertically arranged on the first weighing balance 310, the top surface of the telecentric parallel light source 320 is a luminous surface, the luminous surface is provided with a bearing area, and the gemstone sample is arranged in the bearing area during measurement. The CCD industrial camera 330 is positioned above the telecentric parallel light source 320 and coaxial with the telecentric parallel light source 320 and is fixed on a support 142 vertically arranged on the worktable 100. The lens end of the CCD industrial camera 330 is provided with a telecentric lens 331 coaxial with the CCD industrial camera, and the telecentric lens 331 is matched with the telecentric parallel light source 320, so that the resolution of the gray value of the image can be effectively improved, and the definition and the accuracy of the image outline are greatly ensured.
During measurement, the gemstone sample is placed in the load bearing area of the telecentric parallel light source 320, the weight of the gemstone sample in air is measured by the first weighing balance 310, and the measured weight is output to the computer terminal, denoted as m 1, so that the density of the gemstone sample can be measured later.
Meanwhile, a gemstone image is acquired through the CCD industrial camera 330, and then the acquired gemstone image is output to a computer terminal connected with the CCD industrial camera 330, and shape calculation and size calculation are performed through an image processing system built in the computer terminal. Specifically, the specific procedure of the image processing system for shape calculation and size calculation is as follows:
Step S1, shape measurement, specifically:
step S11, the image of the gemstone sample transmitted by the CCD industrial camera 330 is read, gray value conversion is performed on the image of the gemstone sample, and then an edge contour model of the gemstone sample is calculated by an edge detection algorithm (such as Canny algorithm).
And step S12, the obtained edge contour model is matched with the pre-stored shape templates of various gemstones one by one, the matching degree of the edge contour model and each shape template is calculated, and the shape template with the highest matching degree is taken as the contour shape of the gem sample to be measured.
In order to ensure accuracy of shape measurement, in step S12, when the obtained edge contour model is matched with the pre-stored shape templates, if the maximum value of the matching degree of all the shape templates is lower than 60%, the matching is regarded as failed, and the contour shape of the gemstone sample is regarded as an irregular shape type or an unknown shape type.
For a gemstone sample with an irregular shape or an unknown shape, taking a shape template with the largest matching degree with an edge contour model of the gemstone sample as a deviation shape type of the gemstone sample. For example, if the matching degree between the edge contour model of the gemstone sample to be measured and a certain arc shape template is maximum, classifying the gemstone shape into a deviation arc shape; and if the edge contour model of the to-be-measured gemstone sample is the largest with a certain rectangular shape template, classifying the shape of the gemstone sample into a deviation rectangular shape. Thereby facilitating subsequent calculations of the size of the irregularly shaped or unknown shaped gemstone sample.
Step S2, size measurement, specifically:
Step S21, calculating the maximum inscribed circle, the minimum circumscribed circle and the minimum circumscribed rectangle of the outline shape according to an image processing algorithm. The maximum inscribed circle is a circle with a known radius built in the gemstone outline model, and the circle is expanded in the gemstone outline model continuously by increasing the radius of the circle until the point on the circle is just not in the outline, and the finally obtained circle is the maximum inscribed circle. The minimum circumscribing circle means that a circle which can surround the edge outline of the precious stone and has a known radius is constructed outside the precious stone edge outline model, and the radius of the circle is gradually reduced, so that the circle is continuously reduced until the point on the edge outline falls on the circle, and the finally obtained circle is the minimum circumscribing circle. And similarly, the minimum circumscribed rectangle is obtained in the same way as the minimum circumscribed circle.
Step S21, calculating the dimension of the gemstone sample according to the type of the outline shape of the gemstone sample, and if the shape template with the best matched outline shape is circular arc, taking the diameter R1 of the largest inscribed circle as the width of the gemstone sample and taking the diameter R2 of the smallest inscribed circle as the length of the gemstone sample. If the shape template with the best matched outline shape is arc, the length and width dimension (a x b) of the minimum circumscribed rectangle is taken as the length and width dimension of the gemstone sample. By sizing the gemstone sample according to its shape and type, the measured dimensional value can be made more accurate.
The density measurement unit includes a second weigh scale 410 and a "匚" type bracket 420. The second weighing balance 410 is fixed on the third measuring station, the bottom of the '匚' type bracket 420 is fixed on the second weighing balance 410, a hanging basket 430 is hung on the top of the '匚' type bracket 420, and a screen leakage 431 is arranged at the lower end of the hanging basket 430. A container 440 containing a liquid medium is provided at the third measuring station, the container 440 being located below the basket 430 and a screen 431 is suspended in the liquid medium of the container 440.
During measurement, the hanging basket 430 is taken out of the '匚' type bracket 420, a gemstone sample to be measured is placed in the sieve 431, then is placed in the container 440 and is hung on the '匚' type bracket 420, the weight of the gemstone sample in a liquid medium is measured through the second weighing balance 410, and the measured weight data is output to a computer terminal and is recorded as m 2. According to the built-in density measurement formula of the computer terminalThe density of the gemstone sample was calculated. Where ρ2 is the density of the liquid medium density.
In this example, distilled water was used as the liquid medium, and the density thereof was 1g/cm 3.
The intelligent precious stone sample parameter measuring device provided by the technical scheme of the invention can automatically measure the weight, shape, size, density and other parameter values of the precious stone sample, and simultaneously obtain the effect picture of the precious stone sample, thereby greatly improving the efficiency of precious stone parameter measurement. All measured parameter values are obtained by calculation based on an image processing algorithm, so that the relative error is small, and the problems of poor consistency and low reliability of manual measurement are effectively avoided; meanwhile, each measured parameter can be directly transmitted to the computer terminal, and is directly uploaded to the system after being processed by the computer terminal, so that the efficiency of parameter sharing is effectively improved.
Preferably, on the basis of the above embodiment, the workbench 100 is provided with a mounting cavity surrounded by a plurality of side plates 110, the cavity opening of the mounting cavity is provided with a cover plate 120 for sealing the mounting cavity, and the first weighing balance 310 and the second weighing balance 410 are arranged in the mounting cavity. The lower end of the telecentric parallel light source 320 traverses the cover plate 120 and is fixed on the first weighing balance 310. The second weighing balance 410 is provided with a T-shaped round table 411, the bottom of the T-shaped round table 411 is fixed on the second weighing balance 410, and the top of the T-shaped round table 411 passes through the cover plate 120. The bottom of the "匚" bracket 420 is fixed to the top of the T-cone 411. The cover 120 is provided with a bracket 441 at a position opposite to the basket 430, and the container 440 is fixed to the bracket 441. By arranging the first weighing balance 310 and the second weighing balance 410 in the closed installation cavity, the influence on the measurement result caused by other objects falling on the first weighing balance 310 and the second weighing balance 410 in the measurement process can be effectively avoided, and the accuracy of measurement data is ensured.
Preferably, on the basis of the above embodiment, a placement groove is disposed at a position of the cover plate opposite to the high-definition camera 210, and the placement groove is provided with the object carrying plate 230. The carrying board 230 can be provided with various colors, and when the gemstone samples with different colors are shot, the carrying board 230 with different colors can be replaced to be suitable for the gemstone samples with different colors, so that the photo effect of the gemstone samples is better.
Preferably, on the basis of the above embodiments, a plurality of adjustable foot cups 130 are provided at the bottom of the table 100. By providing the foot cup 130, the level of the table 100 can be adjusted to ensure accurate measurement of the first and second weight scales 310, 410.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, as any minor modifications, equivalents, and improvements made to the above embodiments according to the technical principles of the present invention should be included in the scope of the present invention.
Claims (7)
1. An intelligent precious stone specimen parameter measurement method is characterized in that the intelligent precious stone specimen parameter measurement method is realized by adopting an intelligent precious stone specimen parameter measurement device, and the device comprises:
The device comprises a workbench, and a shooting unit, a size measuring unit and a density measuring unit which are sequentially arranged on the workbench, wherein the workbench is provided with a first measuring station, a second measuring station and a third measuring station which are in one-to-one correspondence with the shooting unit, the size measuring unit and the density measuring unit;
The shooting unit comprises a high-definition camera arranged right above the first measuring station and top light sources symmetrically arranged on two sides of the high-definition camera, and the light emergent surface of each top light source faces the first measuring station;
The size measurement unit comprises a first weighing balance arranged at a second measurement station and a telecentric parallel light source arranged on the first weighing balance, wherein a bearing area is arranged on the light emitting surface of the telecentric parallel light source, a CCD industrial camera is arranged above the bearing area, and a telecentric lens which is opposite to the bearing area of the telecentric parallel light source is arranged at the lens end of the CCD industrial camera;
The density measurement unit comprises a second weighing balance arranged at a third measurement station and a '匚' type bracket arranged on the second weighing balance, a hanging basket is hung on the '匚' type bracket, a screen is arranged at the lower end of the hanging basket, and when density is measured, precious stones are placed in the screen; a container filled with liquid medium is arranged below the hanging basket, and the sieve is positioned in the liquid medium of the container;
The method comprises the following steps:
Step S1, shape measurement, specifically:
S11, acquiring a gemstone sample image through a CCD industrial camera, converting gray values of the acquired image, and calculating the edge contour of the gemstone sample in the image through an edge detection algorithm;
step S12, matching the obtained edge contour with a pre-stored precious stone shape template, and taking the shape template with the highest matching degree as the contour shape of the precious stone sample;
step S2, size measurement, specifically:
step S21, calculating the maximum inscribed circle, the minimum circumscribed circle and the minimum circumscribed rectangle of the outline shape through an image processing algorithm;
Step S21, according to the type of the outline shape of the gemstone sample, if the outline shape is circular arc type or biased circular arc type, taking the diameter R1 of the largest inscribed circle as the width of the gemstone sample and taking the diameter R2 of the smallest inscribed circle as the length of the gemstone sample;
if the outline shape is rectangular or biased rectangular, the length and width dimensions of the minimum circumscribed rectangle are used as the length and width dimensions of the gemstone sample;
step S3, density measurement, specifically:
step S31, measuring the weight of the precious stone sample in the air through a first weighing balance, and recording as ；
Step S32, measuring the weight of the gemstone sample in the liquid medium by a second weighing scale, denoted as；
Step S33, according to the density measurement formulaWherein, the method comprises the steps of, wherein,For the density of the gemstone sample,Is the density of the liquid medium.
2. The intelligent gemstone specimen parameter measurement method of claim 1, wherein the output ends of the high-definition camera, the CCD industrial camera, the first weighing balance and the second weighing balance are all connected with a computer terminal.
3. The intelligent gemstone specimen parameter measurement method of claim 1 wherein the first measurement station is provided with a placement slot in which a carrier plate is removably disposed.
4. The intelligent precious stone specimen parameter measurement method according to claim 1, wherein a plurality of side plates are arranged on the workbench to form a mounting cavity, a cavity opening of the mounting cavity is provided with a cover plate for sealing the mounting cavity, and the first weighing balance and the second weighing balance are arranged in the mounting cavity; the lower end of the telecentric parallel light source traverses the cover plate and is connected to the first weighing balance; the second weighing balance is provided with a T-shaped round platform, the bottom of the T-shaped round platform is fixed on the second weighing balance, the top of the T-shaped round platform penetrates through the cover plate, and the bottom of the 匚 -shaped support is fixed at the top of the T-shaped round platform.
5. The method for measuring parameters of an intelligent gemstone sample according to any of claims 1-4, wherein the bottom of the table is provided with a plurality of adjustable cuvettes.
6. The intelligent gemstone specimen parameter measurement method of claim 1, wherein in step S12, when the obtained edge profile is matched with a pre-stored gemstone shape template, if the maximum value of the matching degree of all shape templates is less than 60%, the matching is considered as failed, and the profile shape of the gemstone specimen is considered as an irregular shape type.
7. The method for measuring parameters of an intelligent gemstone sample according to claim 6, wherein in the step S21, if the matching degree between the outline shape of the gemstone sample and the circular arc shape template is higher than or equal to the matching degree between the outline shape of the gemstone sample and the rectangular shape template, the outline shape of the gemstone sample is considered to be biased towards the circular arc shape; otherwise, if the matching degree of the outline shape of the gemstone sample and the rectangular shape template is higher than or equal to the matching degree of the outline shape of the gemstone sample and the circular arc shape template, the outline shape of the gemstone sample is considered to be biased towards the rectangular shape.
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| GB1416568A (en) * | 1972-10-20 | 1975-12-03 | Wilson S S | Method of and apparatus for evaluating registering and identifying gemstones |
| US20050117145A1 (en) * | 2003-11-28 | 2005-06-02 | Joshua Altman | Detection of imperfections in precious stones |
| GB201219519D0 (en) * | 2012-10-30 | 2012-12-12 | Beers Centenary De Ag | Measuring parameters of particulate material |
| CN104697890A (en) * | 2015-02-13 | 2015-06-10 | 刘立帅 | Relative density rapid detector for jewel and jade and using method of rapid detector |
| US9678018B2 (en) * | 2015-03-30 | 2017-06-13 | Gemological Institute Of America Inc. (Gia) | Apparatus and method for assessing optical quality of gemstones |
| CN205593934U (en) * | 2016-03-24 | 2016-09-21 | 欧阳锡伟 | Precious stone information acquisition device |
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