US2143084A - Imitation stone - Google Patents

Description

Jan/10, 1939. H. '1. NIRENSTEHN 2,143,084

IMITATION STONE Filed Maich 15, 1957 INVENTQR. ZZZ/s f .M/PENSTE/M -5 Am h p ipal objects which the present numeral H and the third part, as the stem she11,'2 5

do d method in the m re and s m y of tion at the upper widest part thereof next thelO .15 a one-piece C n t u ti n; t ur simplicity of stem shell to be the same where those parts meetfi Patented Jan. 10, 1939 I 2,143,084

-UNITED STATES PATENT OFFME IMITATION STONE Harris I. Nirenstein, New York, N. Y.

Application March 15, 1937, Serial No. 131,005

1 Claim. (01. 63-32) This invention relates to improvements in imisaid parts interfitted to form the completed artation gems and/or precious stones. ticle. One of said three parts, as the mid-body Objects portion, is indicated by the reference numeral Ill, the second part, as the reflector portion, by the invention has in view arer-to be enabled to by t numeral 2 The body pgrfion m prefan t imitation gems to s y Simulate erably provides the face or exposed portion of t genuine article; to e enabled to manufacthe gem and the usual stem portion 13 extending u e imitation gems ap y; utilize a downwardly from the top thereof. Said stem por- D provide means for aiding in giving briltop or face of the gem preferably is of less diama ce t0 t fi s to utilize mea s for eter than the face, as at l, to accommodate the assembling the Co p te p s d app y he thickness of the reflector portion H and stem et vwhereby the parts Will be r e irltO shell l2 to enable the diameters of the face and construction and operation in the manufacture In carrying out the invention the face or top and method of making the gems; a Obtain portion In with the setting or stem portion l3 Other adva a es a d esul s m y b bro and the set-in portion I4 preferably may be suitout in the following description. ably formed with the usual facets, as by die cut- Drawing ting, and then made fast with respect to thei reflector member H and stem shell 12 by any Figure 1 is a sectional View of a mold having suitable method. One such method is shown in a die for shaping a composite part and consisting Figures 1 to 3 ihchlsive, in which I have shown of the first step incu r ng u the lrlethodi a mold l5 having a conically shaped depression I6 u e 2 IS a Slmllar V a d ShOWmg the in the top thereof. Said depression I6 is pro- 5 0nd step of the met od; vided with internal facets I? and is adapted to Figure 3 iS a Similar View and Showing the final receive molten glass therein, whereby when heat step of the method and the composite parts comis apphed to t m 1; proper temperature p y a d; the glass on its exterior surface will be suitably Figure 4 is a View of the finished gem Showing shaped and faceted. The initial step of the 30 one-half thereof in elevation and the other half method may t he refer ed to as the introducin Secti tion of or production of molten glass in the mold. Figure 5 is a sectional view Of one Of the parts The reflecto m ember II before being applied C p t y p to the hot molten glass is first preshaped and Figure 6 is p p V Of the Same; and preferably to correspond to the shape of the 35 Figure 7 S a m d fied Cons ru Of the gem faceted mold depression and can be positioned S ow the Sa p y broken ywithin the depression in spaced relationship to Description the Wall thereof. In this connection, the reflector member I I preferably is hollow and of metal, and As W111 be seen, In the dmWmg the mventlon constructed of a heat resistance material, such 40 is Particularly dlrected 9 the manufacture of as copper rodium plated and finished with a brilimitation gems, Such as dlamonds and/or other liance which will present the sparkle to the comprecious and semi-precious stones. In the method pleted It likewise is to be understood that of making the gems. it W111 be noted t the the said metal reflector member H may be proshapes may be of Vanous Styles and cuts t0 vided with interior and exterior facets, and may 45 late square cuts, emeralds, pear shape, marquisite, then be inserted in the depression "5 and baguette and round- However for purposes of tered therein with its facets in substantial regisdescription the illustration as shown is for round tration with but Spaced from the facets of the out gems. depression, forcing the molten glass to fill the efe r now to Figures 4 to 6 inclusive the space outside the reflector member and thus form 50 m s sts of a plurality of pa united the stem shell 12 as shown in Figure 2. gether. In the specific embodiment shown in the Simultaneously with inserting the reflector drawing the gem preferably is made of three member H to the interior of the stem shell 12, parts, each part having suitable facets formed is the introduction of the body material, unificathereon, as is usual in cut gems, with each of tion thereof with the stem shell, and shaping of 55 the exposed face with facets. An exemplification of this is indicated in Figure 3 wherein the glass or other material to form the gem body I0 is introduced in such plastic or semi molten state as to build up above the level of the die 15 having depression l6. The material is thus built up over the top edge of the reflector member H and unifies with the material, still plastic, forming stem shell !2. This unification is completed by pressure from an upper die which also acts to shape *the face and form the upper facets.

The gem resulting from the method outlined is accordingly and preferably a unified body and stem shell containing a reflector member in close contact on the one side with the stem portion and on the other side with the stem shell, The gem is provided with a faceted stem, the reflector member is within the stem and is likewise faceted, preferably having its facets corresponding to the exterior facets of the stem portion. The fact that the reflector member is thus not only embedded within the gem in close surface contact with the material forming the body of the gem and forming the shell, renders the presence of the reflector as such inconspicuous, but on the other hand obtains a brillianoy of the gem both from the upper face and when observing the stem, which closely simulates a genuine gem.

There are other detail steps in the method and other detail differences in the ultimate construction which will be deemed within the scope of the present invention, and as one such, attention is called to Figure '7. According to the shov ing of Figure 7 1 provide a preformed stem shell I 2', which, as in the herebefore described construction, may be of glass or other suitable material. This shell having substantial and uniform thickness and faceted inside and out. A gem body is provided having an exposed faceted portion Ill and a stem portion E3 the size, shape and facet of the stem portion i3 is such that it will substantially fit against the inside surface of the stem shell in intimate contact therewith throughout. In order to accommodate the thickness of the stem shell, the stem portion is made of less diameter at its end next the face portion 10 so that the facet portion will overlie the upper edge of the stem shell as at M. The inside surface of the stem shell is preferably coated as at H with a suitable reflecting or shiny material, for instance mercury and the outsidelsurface of the stem portion I 3' is similarly coated with a reflecting or shiny material II, which also may be mercury or other suitable material of which silver chronimum and the like are examples. The stem portion 13 is assembled within the stem shell 12 and the reflecting materials or coating Ii and H" are then juxtaposed against each other. The thickness of these coatings is substantially nothing more than a film and with the one coating supplementing the other, there will be increased reflection and light to produce brilliancy in the gem whether observed from the top or from the stem. The film-like thickness of the reflecting material thus makes it proper to state that the stem shell and stem portion of the body portion are in intimate association in the assembled gem. The parts are held together by appropriate adhesive, and the gem will appear as being an integral gem closely simulating a genuine gem,

I claim:

An artificial gem comprising a stem portion, and a face portion, a stem shell shaped to surround the stem portion, said stem portion being of less diameter than the face portion where joined, a reflector juxtaposed to the stem portion the diameter of its wider part being less than the face portion and stem shell and entirely surrounded by the said stem shell thereby presenting a reflecting surface to both the face portion and stem shell.

HARRIS I. NIRENSTEIN.

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