Improvements in the Manufacture of Artificial Stones Employed in Jewellery.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Artificial Stones Employed in
Jewellery.
I, SAMUEL GROSSIORD, of Aux Moussieres (Jura) in the Republic of France,
Lapidary, do hereby declare the nature of this invention to be as follows:-
This invention relates to improvements in the manufacture of artificial stones
employed in jewellery. The object of these improvements is, to impart to such
stones if they are white imitations-a scintillation resembling as nearly as
possible that of a real diamond and if they are differently, coloured imitations―
clearly defined and distinct colourations.
The essential feature of my invention consists in welding a sheet, blade or
plate of window glass or other analogous material between two blocks of imitation-
products or other analogous material, the welding being effected in direct contact
with the fire, then cutting the block thus formed in the ordinary manner, but
so, that the sheet, blade, or plate of interposed window glass will, in the finished
stone, occupy a position centrally perpendicular to the main axis of the stone.
The substances employed are strass and window glass or white glass.
Strass a variety of crystal containing a large percentage of lead. Chemically
it is a colourless salt which may be considered as a borosilicate of potassium, of
sodium and of lead.
On the same principle a (white or coloured) block of imitation material may
be inserted between two plates of window glass, or in other words the above pro-
cess may be reversed. It is moreover possible, to use but one single block of
(white or coloured) imitation material, welded on a single plate of window
glass, which latter, after the cutting, forms either the base or the top of the
stone.
In order that my invention may be thoroughly understood, I will now more
particularly describe the same.
According to one method of carrying out my invention I provide two blocks of
imitation or other analogous material of one and the same quality and a sheet,
blade or plate of window glass or other similar material adapted to be inter-
posed between the two masses or blocks of imitation material.
According to another method I provide a single block of imitation or other
analogous material and two blades, sheets or plates of window glass or other
similar material, between which the said block is to be interposed.
These different pieces are arranged upon a recessed fire-proof table and then
placed in the furnace, in order to effect the welding together by producing a
semi-fusion of the material under treatment.
The blocks, thus produced, irrespective of whether the masses or pieces of
imitation material be coloured or colourless-are subsequently cut in the ordinary
manner, but so that the parts of imitation material respectively form one the
top and the other the base, while the glass plate forms the crown.
When the blocks of imitation material are colourless, the crown of glass pro-
duces the following effect, as the plate of glass is clearer and more transparent

page_text: than the blocks of imitation material, it causes the facets, cut into the top and
the base, to more efficiently reflect, and imparts to the stone, thus formed, scin-
tillations and a fire similar to that of a real diamond.
When the blocks of imitation substance are variously coloured, the window
glass crown produced the effect hereinafter indicated.
First of all, seeing that the fusing point of the glass is higher than that of
the imitation substance, the window glass plate has not entered into combination
with the blocks which have retained their proper colour; moreover, owing to the
transparency of the window glass the colour of the base will, when the cutting has
been effected, appear all around the stone without, however, penetrating to the
top where the colour remains more intense and appears distinctly in the middle
of the stone.
The cutting may, of course, be effected in any way and the number of facets
does not in any manner modify the effect produced.
According to another modification a block of (white or coloured) imitation
material is welded on to a plate, sheet or blade of window glass.
The block thus produced, is subsequently cut in such a manner that the glass
either forms the base or the top. The result, obtained in the case of this modifica-
tion, is identical with that before indicated.
It should finally be observed, that in each one of the preceding examples the
face or faces of the imitation substance in contact with the glass plate or plates
may be polished prior to the welding operation.
Dated this 31st day of August 1898.
HASELTINE, LAKE & Co.,
45, Southampton Buildings London, W.C.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Artificial Stones Employed in
Jewellery.
I, SAMUEL GROSSIORD, of Aux Moussiéres (Jura) in the Republic of France,
Lapidary, do hereby declare the nature of this invention and in what manner the
same is to be performed, to be particularly described and ascertained in and by
the following statement:-
This invention relates to an artificially made stone designed for use in con-
nection with jewellery. Stones produced according to this invention give scin-
tillations almost equal to those of real diamonds of which they form imitations as
complete as possible.
The accompanying drawing represents by way of example several forms of
this novel stone.
Figure 1 shows an artificial stone formed of two blocks a and b of strass welded,
for instance by semi-fusion, to a plate c of window glass (as shown in the draw-
ing by the two dotted lines) which latter is thus located between the two blocks
of strass, the whole having the aspect of a single piece. The stone shown in
the drawing is cut in the fashion of a real diamond and the glass-plate forms the
part known as the crown thereof while the strass blocks form the table and the
pavillion respectively.
Figure 2 shows another form of artificial stone in which a plate of strass a¹ is
comprised between two pieces of window glass c¹ and . In this modification the
strass plate forms the crown while the window glass forms the table and the
pavillion respectively.

page_text: Figure 3 shows a third form in which the strass a² is welded upon the window
glass this latter forming the pavillion and the strass forming the table.
Figure 4 shows a fourth form in which the window glass forms the table
while the strass a² forms the pavillion.
The strass used in the preparation of this stone may be coloured or colourless.
The plate of window glass regardless of its place in the stone with regard to
the strass, causes the cut faces of the table and of the pavillion to reflect to an
increased extent and gives the stone thus formed scintillations of light much like
those of real diamonds. This effect is due to the window-glass being more limpid
and more transparent than the strass.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is:-
1. An artificial stone for use in jewellery formed of strass and window-glass
welded together in any convenient manner so as to constitute a single block.
2. An artificial stone for use in jewellery characterized in Claim 1, of which
the pavillion and the table consist of colourless strass while the crown is of
colourless window glass.
3. An artificial stone for use in jewellery as claimed in Claim 1, in which the
pavillion and the table are formed of coloured strass and the crown of colourless
window glass.
8. An artifical stone for use in jewellery as claimed in Claim 1, in which the
pavillion and the table consist of colourless window-glass and the crown of
colourless strass.
5. An artificial stone for jewellery as claimed in Claim 1, in which the pavillion
is formed of colourless window glass and the crown of coloured strass.
6. An artificial stone as claimed in Claim 1, in which the pavillion is formed
of colourless window-glass and the crown and table of colourless strass.
7. An artificial stone for jewellery as claimed in Claim 1, of which the pavillion
consists of colourless window glass and the crown and table of coloured strass.
8. An artificial stone for use in jewellery as claimed in Claim 1, in which the
table is formed of colourless window-glass and the pavillion and crown of colour-
less strass.
9. An artificial stone for use in jewellery as claimed in Claim 1, in which the
table is formed of colourless window-glass and the pavillion and crown of coloured
strass.
Dated this 30th day of August 1800
HASELTINE, LAKE & Co.,
45, Southampton Buildings London, W.C.,
Agents for the Applicant.