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Патент USA US3088204

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May 7, 1963
Filed Oct. 10, 1960
FIG. 7
Km, DJM ‘14.46
United States Patent 0 ""IC€
Patented May 7, 1963
synthetic can be successfully used in the practice of this
invention it the difference in chemical formulae is only
Joseph Genoa Donadio, 1776. Foster Ave.,
Schenectady, N.Y.
Filed Oct. 10, 1960, Ser. No. 61,667
4 Claims. (Cl. 29-—160.6)
to include coloring.
Thus, a stone having a chemical
formula Al2O3MgO has been used with a melting point
of 2135° C., a cubic crystal system with a refractive
index of 1.72. In its preferred form, however, the syn
thetic sapphire is used having the characteristics and
formulae set forth above.
Boule 10 upon receipt from the producer thereof is
This invention relates generally to the manufacture of
jewelry and more particularly to the manufacture of a 10 cleaved along stress lines such as, for example, stress line
11 shown in boule 10 in FIG. 1. The cleaving can be
jewelry piece containing a synthetic star sapphire.
accomplished by simply hitting the boule with a hammer‘
In the production of certain types of jewelry and espe
or other weighty object. Slabs are then cut from. the
boule to obtain wafers for working. An elevation of one
jewelry pieces, it is desirable to produce an acceptable 15 of these wafers is shown in FIG. 2 and indicated therein
by the numeral 12. The wafer shown in FIG. 2 has an
product which can be sold on the market at a cost within
cially in the production of school jewelry wherein.all
members of a graduating class seek to purchase identical‘
the reach of the majority of persons. Many attempts
outline which is a perfect circle, however, in. practice this
is not always the case. The Wafer is then cut, shaped
have been made to ?ll this de?nite need and certain syn
and polished to obtain a dome-shaped stone similar to a
thetics have been used in the manufacture of such jew
elry. For the most part, however, in order to maintain 20 cabochon.
In the working of the stone the cutting is accomplished
the ultimate selling price within the reasonable reach of
with diamond impregnated blades as is the standard pro
school graduates, the piece has been produced in such a
cedure in the lapidary trade and where grinding is nec
manner that it is either fragile, the stone does not glisten
essary, a face is used on the grinding machine impreg
or exhibit jewel characteristics, and/or the stone used in
the piece has been so small that it has appeared out of 25 nated with diamond dust. The original cleaving of the
boule prevents breaking of the stone later while it is
proportion with the piece setting.
being worked on, or breaking of the stone after it has
The synthetic star sapphire jewelry piece which is the
been installed in a piece of jewelry.
subject of this invention satis?es the requirements for an
acceptable product which can be sold on the market at
a cost within the reach of the majority of school gradu
ates and the jewelry piece which is the subject of this
invention ‘has characteristics which overcome the di?i
In the shaping of the wafer or stone shown in FIG. 2
a ?at surface is formed on the stone. In FIG. 4 an
exploded view has been made illustrating component
parts of the resultant product. The part indicated by
culties in such pieces heretofore produced.
the numeral 13 is the stone substantially in the form
achieved during the ?nishing, shaping and polishing. It
The invention herein disclosed has as its principal ob
ject the provision of a method of producing a piece of 35 is noted that dome 13a is present and opposite dome 13a
is a highly polished ?at surface 13b. The surface 13b
jewelry containing a synthetic stone which will exhibit
has been polished to a very ‘high degree and a diffraction
a brilliant star when subjected to a point of light.
pattern is applied thereto.
Another object of this invention is to disclose a method
In order to apply the diffraction’ pattern to the polished
of producing a synthetic star sapphire for use in a jewelry
with a minimum of expense, a minimum of expensive 40 flat surface 13b of the stone, several ?xtures are used.
Two of these ?xtures are illustrated in FIG. 3'. The ?rst,
materials and in a relatively short period of time.
which is a board in the form of a hexagon, is indicated
A further object of this invention is to disclose a
generally by the numeral 14 in FIG. 3, and the second
method for production of a synthetic star sapphire jeW-Jv
which .is a board provided with a ?at upper surface is
elry piece which will maintain its characteristics inde?
45 indicated generally by the numeral 15 in FIG. 3. The
nitely and resist damage due to wear.
A synthetic star sapphire jewelry piece and the method
of manufacturing the same is described herein with ref
erences to the drawings in which:
FIG. 1 is an elevational view of a boule of synthetic
material as received from, the producer thereof;
FIG. 2 is a plan view of. a wafer cut from the boule
‘ ?at upper surface of board 15 is indicated by the nu
meral 16 and a straightedge 17 is provided projecting up
wardly from surface 16. An opening or slot 18 is pro
vided in board 14 and these two ?xtures together with
50 like ?xtures are used to establish a diffraction pattern on
flat surface l~3b>of stone 13.
After the surface 13b has been polished and in order to
apply the diffraction pattern thereto surface 16 of board
15 is covered with lead which is impregnated with dia
tures used in practicing this invention;
FIG. 4 is an exploded perspective view of a star stone’ 55 mond dust and mineral oil. The diamond dust is of
suitable mesh and, as will be explained below, several
constructed in accordance with the teachings of this in
values. of mesh are utilized. At this step in thelprocess,
vention and ready for insertion in a setting;
shown in FIG; 1;
FIG. 3 is a front. perspective view of two of the ?x’.
however, the diamond dust used has a mesh of about
5 is a segmentary front view of the assembled
600 per square inch and the mineral oil is used to help
a jewelry ?xture;
6 is a segmentary side view of the assembled 60 hold the diamond dust to the lead. The mineral oil is
used merely to wet the diamond dust. Wax is then
a jewelry ?xture; and
placed within slot 18 in board 14 and dome 13a of stone
FIG. 7 is a plan view of a surface of one of the com-,
13 is inserted within slot 18 with ?at surface 13b pro
ponents of the gem showing grooves placed therein.
In FIG. 1 a synthetic sapphire in the form of a boule, 65 jecting therefrom. One edge of board 14, such as side
14a, is then applied to straightedge 17 and rubbed back
is indicated generally by the numeral 10. This is the.
and forth thereon. A group of parallel grooves will then
form of the synthetic stone upon receipt from the manu
be obtained in surface 13b. The board 14 is then rotated
facturer therof. Best results in practicing this method
so that side 14b is adjacent straightedge 17 and the proc
have been obtained ‘by use of such a sapphire synthetic
ess repeated after which side 140 is placed adjacent
material having a chemical formula A1203; melting point 70 straightedge 17 and the process repeated. This results
of 2050° C., with a hexagonal crystal system and a re
in establishing on surface 13b of stone 13 a diffraction
fractive index of 1.760, 1.768. Different formulae of
pattern consisting of three groups of parallel lines. The
gem in
gem in
lines of each group form with the lines of either of the
other groups an angle of 120°. The lines are in the
form of grooves in surface 13b of stone 13.
For an excellent diffraction pattern it is advisable to
repeat the process utilizing ?rst diamond dust of 700
mesh and then diamond dust of 800 mesh. For this pur
pose best results have been obtained by utilizing two ad
diamond dust to obtain a diffraction pattern by utilizing
the ?xture, the ?at surface over which the ?at surface of
the stone is to be applied having a straightedge projecting
upwardly therefrom, a side of the ?xture being rubbed
against the straightedge of the surface containing the
?nely divided diamond dust particles during the ?rst men
tioned rubbing step with the ?at surface of the stone in
contact with the dust, applying a light-re?ecting material
to the ?at surface, bonding a backing to the ?at surface
ditional boards of the type of board 14.
A light re?ecting material which is also a bonding
agent is then applied to the ?at surface of the stone over 10 and fastening the resultant stone into a jewelry ?xture.
2. The method of producing a piece of jewelry con
the diffraction pattern. The bonding material which has
taining a synthetic star sapphire in accordance with claim
been used with success in practicing this invention con
1 in which the ?xture used has three straight sides at 120°
sists of an alloy containing 30% lead, 60% tin and 10%
angles so that upon applying each of these sides in turn
titanium. This material, which is indicated generally by
to the straightedge of the surface containing the diamond
the numeral 18' in FIG. 4, accomplishes two things: it
dust and by passing the ?at surface of the synthetic stone
re?ects a point of light which is directed toward the ?n
over the diamond dust with each of the three sides of
ished product and also the material enables the bonding
the ?xture applied to the straightedge a diffraction pat
of a stone backing 19 to stone 13. The stone backing is
tern will be obtained consisting of a series of grooves in
a much cheaper grade of material than dome 13 and
20 the ?at surface wherein the grooves will be at angles of
forms the ‘bottom part of the stone.
120° with each other.
The combination of stone 13, stone backing 19 and
3. The method of producing a piece of jewelry con
bonding alloy 18' is placed in a vacuum chamber. The
vacuum chamber is then evacuated and the stones are
taining a synthetic star sapphire consisting of obtaining
a boule of the synthetic material, cleaving the boule along
heated with induction heating. When the stones reach
a temperature of about 550° to 650° C. the titanium, tin 25 stress lines, cutting a stone, shaping the stone so that it
and lead go into an alloy and at the same time the stones
has at least one ?at surface, polishing the ?at surface,
are wetted for a high degree of bond.
The vacuum pre
vents oxidation and gives the wetting agent needed. The
wetting ability of titanium under these conditions gives an
taking a board with a ?at upper surface and a straightedge
projecting upwardly therefrom and covering the board
with lead impregnated with diamond dust and mineral oil,
excellent result and the tin and lead are su?iciently ?uid 30 taking a six-sided ?xture and forming a slot therein, in
serting wax in the. slot, inserting the synthetic star sap
to prevent cracking of the stone sapphire. The alloy
phire in the wax with the ?at surface exposed, placing a
achieved in the furnace upon heating, of course, could
side of the ?xture against the straightedge of the board
have been achieved prior to heating. In the preceding
and rubbing the ?at surface of the stone against the dia
description wafer 18’ was referred to as an alloy of tin,
lead and titanium. Wafer 18' can be an alloy of these 35 mond dust, placing a second side of the ?xture against the
straightedge and rubbing the ?at stone, placing a light
three materials prior to insertion in the vacuum chamber
re?ecting material adjacent the ?at surface of the stone,
or the alloy can be achieved in the chamber itself. When
fastening a stone backing against the light-re?ecting sur
the desired temperature is reached a high degree of bond
is achieved and as the star is cooled to room temperature
0 face material and placing the resultant stone into a jew
the excessive bonding alloy is removed and the stone is 40 elry ?xture.
4. The method of producing a piece of jewelry in ac
shaped to ?t standard bezels and other jewelry ?xtures.
The resultant stone appears as a beautiful star sapphire
cordance With claim 3 in which there is utilized diamond
dust of di?ferent mesh when the second side of the ?xture
and the backing 19 aids in reducing the ultimate cost of
is placed against the straightedge and the ?at stone rubbed
the stone. A ring formed with such a stone can be
marketed at a price which can be paid by the majority of 45 in order to obtain a second set of lines of different depth
school graduates and the ring will maintain its charac
and width than the set of lines obtained by rubbing the
teristics over long periods of time.
Thus, among others, the several objects in the inven
tion as speci?cally aforenoted, are achieved. Obviously,
numerous changes in construction and rearrangement of 50
parts might be resorted to without departing from the
spirit of the invention as de?ned by the claims.
I claim:
1. The method of producing a synthetic star sapphire
for use in a piece of jewelry consisting of obtaining a
boule of the synthetic sapphire material, cutting a stone
from the boule, shaping the stone so that it has at least
one ?at surface, fastening the stone to a surface of a ?x
ture having a plurality of straight sides, rubbing the ?at
surface over a ?at surface covered with ?nely divided
' stone with the ?rst side of the ?xture against the straight
References Cited in the ?le of this patent
Andrews ____________ __ May 18,
Strothman ___________ __ Aug. 17,
Mukai ______________ _._ June 13,
Moyd ______________ ._ Dec. 26,
Burdick et *al. _______ __ Sept. 28,
Coxe _______________ __ Mar. 27, 1956
Germany _____________ __ Oct. 4, 1932
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