US 11,633,022 B2Granted

Gemstone and methods of cutting the same

AssigneeAlbert Gad Ltd.

InventorReuven Paikin

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Abstract

A gemstone includes a crown, a pavilion, and a girdle disposed between the crown and the pavilion. The girdle has an elliptical cross-section with a major axis and a minor axis. The surface of the gemstone is generally divided into a number of groups of interlocking facets disposed at a variety of angles. The groups of facets comprising the surface of the crown generally include star facets, upper intermediate crown facets, lower intermediate crown facets, main crown facets, and upper girdle facets. The upper girdle facets generally abut an upper edge of the girdle. The groups of facets comprising the surface of the pavilion include culet-adjacent facets, candle facets, main pavilion facets, and lower girdle facets. The lower girdle facets generally abut a lower edge of the girdle.

Claims27

Dependent claims

A gemstone comprising:

a girdle defining a perimeter of the gemstone, the girdle having an elliptical cross-section with a major axis and a minor axis, the major axis being larger than the minor axis;
a crown forming an upper portion of the gemstone, a surface of the crown including:
a table forming a generally horizontal upper surface of the crown;
a plurality of star facets, each of the plurality of star facets being disposed adjacent to and abutting an edge of the table;
a plurality of upper intermediate crown facets, each of the plurality of upper intermediate crown facets being disposed generally between two of the plurality of star facets, an upper vertex of each of the plurality of upper intermediate crown facets abutting a vertex of the table, the plurality of upper intermediate crown facets including major upper intermediate crown facets, minor upper intermediate crown facets, and median upper intermediate crown facets;
a plurality of lower intermediate crown facets, each of the plurality of lower intermediate crown facets being disposed between two of the plurality of upper intermediate crown facets, an upper vertex of each of the plurality of lower intermediate crown facets abutting a lower vertex of one of the plurality of star facets;
a plurality of main crown facets, each of the plurality of main crown facets being disposed between two of the plurality of lower intermediate crown facets, an upper vertex of each of the plurality of main crown facets abutting a lower vertex of one of the plurality of lower intermediate crown facets, the plurality of main crown facets including a plurality of central major main crown facets and a plurality of minor main crown facets, the plurality of central major main crown facets being aligned along the major axis, the plurality of minor main crown facets being aligned along the minor axis;
and
a plurality of upper girdle facets formed in pairs of adjacent upper girdle facets, each pair of adjacent upper girdle facets being disposed generally between two of the plurality of main crown facets, upper vertices of both upper girdle facets in each pair of upper girdle facets abutting a lower vertex of one of the plurality of lower intermediate crown facets, the plurality of upper girdle facets including a plurality of major upper girdle facets and a plurality of minor upper girdle facets, the plurality of major upper girdle facets being aligned along the major axis, the plurality of minor upper girdle facets being aligned along the minor axis;
and
a pavilion forming a lower portion of the gemstone, a surface of the pavilion including:
a plurality of culet-adjacent facets forming a lower point of the pavilion, the plurality of culet-adjacent facets including a plurality of major culet-adjacent facets and a plurality of minor culet-adjacent facets, the plurality of major culet-adjacent facets being aligned along the major axis, the plurality of minor culet-adjacent facets being aligned along the minor axis;
a plurality of candle facets, a lower portion of each of the plurality of candle facets being disposed generally between two of the plurality of culet-adjacent facets;
a plurality of main pavilion facets, each of the main pavilion facets being disposed between two of the plurality of candle facets, a lower edge of each of the plurality of main pavilion facets abutting an upper edge of one of the plurality of culet-adjacent facets, the plurality of main pavilion facets including a plurality of major main pavilion facets and a plurality of minor main pavilion facets, the plurality of major main pavilion facets being aligned along the major axis, the plurality of minor main pavilion facets being aligned along the minor axis;
and
a plurality of lower girdle facets formed in pairs of adjacent lower girdle facets, each pair of adjacent lower girdle facets being disposed generally between two of the plurality of main pavilion facets, each pair of adjacent lower girdle facets having an upper portion of a respective one of the plurality of candle facets disposed generally therebetween, the plurality of lower girdle facets including a plurality of major lower girdle facets and a plurality of minor lower girdle facets, the plurality of major lower girdle facets being aligned along the major axis, the plurality of minor lower girdle facets being aligned along the minor axis,
wherein the girdle is positioned between the crown and the pavilion, each of the plurality of upper girdle facets being disposed adjacent to and abutting an upper edge of the girdle, and each of the plurality of lower girdle facets being disposed adjacent to and abutting a lower edge of the girdle, and
wherein the gemstone has a table percentage between about 26.5 percent and about 45 percent, and wherein the gemstone has a top depth percentage between about 24.5 percent and about 35 percent.

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Dependencies are inferred from the claim text.

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Abstract

A gemstone comprising:

a girdle defining a perimeter of the gemstone, the girdle having an elliptical cross-section with a major axis and a minor axis, the major axis being larger than the minor axis;
a crown forming an upper portion of the gemstone, a surface of the crown including:
a table forming a generally horizontal upper surface of the crown;
a plurality of star facets, each of the plurality of star facets being disposed adjacent to and abutting an edge of the table;
a plurality of upper intermediate crown facets, each of the plurality of upper intermediate crown facets being disposed generally between two of the plurality of star facets, an upper vertex of each of the plurality of upper intermediate crown facets abutting a vertex of the table, the plurality of upper intermediate crown facets including major upper intermediate crown facets, minor upper intermediate crown facets, and median upper intermediate crown facets;
a plurality of lower intermediate crown facets, each of the plurality of lower intermediate crown facets being disposed between two of the plurality of upper intermediate crown facets, an upper vertex of each of the plurality of lower intermediate crown facets abutting a lower vertex of one of the plurality of star facets;
a plurality of main crown facets, each of the plurality of main crown facets being disposed between two of the plurality of lower intermediate crown facets, an upper vertex of each of the plurality of main crown facets abutting a lower vertex of one of the plurality of lower intermediate crown facets, the plurality of main crown facets including a plurality of central major main crown facets and a plurality of minor main crown facets, the plurality of central major main crown facets being aligned along the major axis, the plurality of minor main crown facets being aligned along the minor axis;
and
a plurality of upper girdle facets formed in pairs of adjacent upper girdle facets, each pair of adjacent upper girdle facets being disposed generally between two of the plurality of main crown facets, upper vertices of both upper girdle facets in each pair of upper girdle facets abutting a lower vertex of one of the plurality of lower intermediate crown facets, the plurality of upper girdle facets including a plurality of major upper girdle facets and a plurality of minor upper girdle facets, the plurality of major upper girdle facets being aligned along the major axis, the plurality of minor upper girdle facets being aligned along the minor axis;
and
a pavilion forming a lower portion of the gemstone, a surface of the pavilion including:
a plurality of culet-adjacent facets forming a lower point of the pavilion, the plurality of culet-adjacent facets including a plurality of major culet-adjacent facets and a plurality of minor culet-adjacent facets, the plurality of major culet-adjacent facets being aligned along the major axis, the plurality of minor culet-adjacent facets being aligned along the minor axis;
a plurality of candle facets, a lower portion of each of the plurality of candle facets being disposed generally between two of the plurality of culet-adjacent facets;
a plurality of main pavilion facets, each of the main pavilion facets being disposed between two of the plurality of candle facets, a lower edge of each of the plurality of main pavilion facets abutting an upper edge of one of the plurality of culet-adjacent facets, the plurality of main pavilion facets including a plurality of major main pavilion facets and a plurality of minor main pavilion facets, the plurality of major main pavilion facets being aligned along the major axis, the plurality of minor main pavilion facets being aligned along the minor axis;
and
a plurality of lower girdle facets formed in pairs of adjacent lower girdle facets, each pair of adjacent lower girdle facets being disposed generally between two of the plurality of main pavilion facets, each pair of adjacent lower girdle facets having an upper portion of a respective one of the plurality of candle facets disposed generally therebetween, the plurality of lower girdle facets including a plurality of major lower girdle facets and a plurality of minor lower girdle facets, the plurality of major lower girdle facets being aligned along the major axis, the plurality of minor lower girdle facets being aligned along the minor axis,
wherein the girdle is positioned between the crown and the pavilion, each of the plurality of upper girdle facets being disposed adjacent to and abutting an upper edge of the girdle, and each of the plurality of lower girdle facets being disposed adjacent to and abutting a lower edge of the girdle, and
wherein the gemstone has a table percentage between about 26.5 percent and about 45 percent, and wherein the gemstone has a top depth percentage between about 24.5 percent and about 35 percent.

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