JPH0375164B2 - - Google Patents

Abstract

1. A gem having face-ground facets, particularly a diamond, which in each of its crown and base portions respectively disposed over and under the girdle plane is provided with four or more ground side facets, which in the base and crown portions terminate in a point, which diamond is provided at its periphery in the girdle plane with external facets and is adapted to be set from sides of the point of the gem, the surfaces of the external facets extending parallel to the longitudinal axis of the gem, characterized in that the external facets (1, 5) have a rhombic configuration and constitute an annular series in which they adjoin at their corners, and in addition to the external facets (5) all side facets (1, 2, 6) have also four corner points.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that four or more side facets are cut above and below the most rounded part that separates the upper and lower parts, respectively. The present invention relates to a cut gemstone, in particular a cut diamond, which extends so as to be converged on one gemstone tip and has a plurality of outer peripheral facets cut around the roundest part.

The brilliance of a gemstone after it has been cut is determined by the position and angle of the facets above and below the rounded part. The most rounded part is the plane that separates the top and bottom of the gemstone. In known gemstone cutting methods, the most rounded portion forms a peripheral separating edge between the upper and lower lateral facets. A normally shaped jewel holder is fitted into one conical part of the jewel, and the other conical part is cut. The remaining gemstone pieces can be used to make smaller gemstones. This cutting process is based on the fact that gemstone crystals are basically octahedral.

In known gemstone cutting methods, particularly diamond cutting, a number of lateral facets are cut above and below the most rounded portions at the top and bottom. As mentioned above, after the jewelry is set in the setting, the protruding or upper point is flattened. Diamonds cut in this way can be used, for example, in German Utility Model Publication No.
No. 7,019,610 and US Pat. No. 2,340,659. In this case, the side edges of the most rounded part are for protection, especially when the jewelry is set on the stand.
It is cut to prevent cracks from forming when the clamp on the pedestal tightens around the jewelry, and as a decoration. Cutting the edges like this has almost no effect on the diamond's brilliance. Further, Australian Patent No. 242416 describes a so-called rose-shaped diamond having round facets, but such cut diamonds are considerably inferior in terms of brilliance.

The purpose of the present invention is to further enhance the brilliance of a gemstone and provide a novel inset shape by making new cutting by making more effective use of the basic structure of gemstone crystals.

The cut jewelry, especially the cut diamond, according to the present invention has diamond-shaped outer facets, is arranged in an annular shape, and is in contact with each other at the ends, and is fitted into the stand from the side of the tip of the jewelry. It is characterized by. By the cutting method of the present invention,
The basic structure of gemstone crystals, that is, octahedrons, can be used more effectively, and after cutting, a shine that has never been seen before can be obtained. Place it face down on an ornament, especially a ring, and insert it from the two jewel tips so that the center line connecting the tips intersects or runs along the ring direction of the ring. The shine is particularly excellent when placed so as not to obstruct the outer faceted ring of the rounded part.

Two preferred embodiments of the invention will now be described with reference to the accompanying drawings.

1 and 2 show a first embodiment of the invention. The cut gemstone has eight lateral facets 1 above and below the most rounded part E, respectively.
It has 2. These lateral facets extend in the conical part of the jewel so as to be focused towards the jewel tips 3 and 4, respectively. A plurality of outer peripheral facets 5 are cut around the most rounded portion E. The outer circumferential facets 5 are rhombic and extend beyond the theoretical intersection of the ends of the lateral facets 1, 2 and the roundest portions.
Furthermore, the circumferential facets are arranged in an annular manner and abut each other at their ends, so that the jewel's point 3
and the jewel point 4 extending parallel to the longitudinal axis A of the jewel.

The lateral facets 1 or 2 are therefore articulated around the roundedest part E with the ring of circumferential facets 5 adjoining each other via their ends. The outer circumferential facet 5 forms an angle of 90 degrees with the end of the upper side facet 1 and the end of the lower side facet 2. Furthermore, from the side of the lateral facets 1, 2, these surfaces terminate at opposite ends of the circumferential facet 5. As mentioned above, the outer circumferential facets 5 arranged to form a ring are rhombic and eight in number.

When cutting gemstones, especially diamonds, the number of upper or lower lateral facets is usually a number divisible by 4, ie 4, 8, 12. This structured cut jewel is placed face down on a stand such as a ring, and is fitted vertically or horizontally into the two jewel tips from the sides, so that it is supported by the stand in a sandwiched state.

3 and 4 show a second embodiment of the invention. In this embodiment, in addition to the upper and lower side facets 1 and 2, facets 6 and 7 are cut so as to form a star shape when viewed from above.
These facets 6, 7 thus border the upper or lower end of the circumferential facet 5 in their most rounded parts. In the cutting method according to the invention, the circumferential facets as well as all the lateral facets have four corners.

[Brief explanation of drawings]

1 and 2 are a side view and a plan view of a first embodiment of a cut jewel according to the present invention, and FIGS. 3 and 4 are side views of a second embodiment of a cut jewel according to the present invention. and a plan view. 1, 2... Lateral facets, 3, 4... Point of jewel, 5... Peripheral facets.

Claims (1)

[Claims] 1. Four or more lateral facets are cut above and below the roundest part that separates the upper and lower parts, and each of the lateral facets has one jewel point at the upper and lower parts. A cut gemstone that extends so as to be converged, and has multiple outer facets cut around the most rounded part.
Particularly in cut diamonds, the outer circumferential facets 5 are diamond-shaped and arranged in a ring, bordering each other at their ends, and the point 3 of the gemstone,
A cut gemstone characterized by being inserted into the stand from the side of 4. 2 Diamond-shaped outer facets 5 arranged to form a ring along the periphery of the most rounded part
, when viewed from above, form an angle of 90 degrees with the ends of the upper and lower lateral facets 1 and 2, respectively, and the lateral facets 1 and 2 are respectively at opposite ends of the outer circumferential facets. The cut jewelry according to claim 1, characterized in that the cut jewelry is finished. 3. Claim 1 characterized in that in addition to the upper and lower side facets, the facets 6 are cut so as to have a star shape when viewed from above.
The cut gemstone according to item 1 or 2. 4. The device according to any one of claims 1 to 3, characterized in that not only the outer circumferential facet 5 but also all the side facets 1, 2, and 6 have four corners. Katsuto jewel. 5. The cut according to any one of claims 1 to 4, characterized in that the plane of the outer circumferential facet 5 extends parallel to the longitudinal axis A-A of the gemstone. jewelry.