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US 2026/0240290 A1Published application
Cut for a diamond
AssigneeComm. V Sugihara Consult
InventorNobuki SUGIHARA
Life of this patent
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Abstract
A cut diamond includes a girdle bordering an upper half and a lower half. The diamond includes at least one pair of adjacent facets forming a groove in the upper and/or lower half. The connecting edge of the pair of adjacent facets goes inward in the diamond. The diamond is a concave polyhedron.
Claims23
A cut diamond comprising:
- a girdle bordering an upper half and a lower half;
- a plurality of first adjacent facets formed in the upper half, each first adjacent facet forming a first groove extending from the girdle to a culet of the upper half;
- a plurality of half facets formed in the upper half between adjacent first grooves, each half facet extending from the girdle to the culet;
- and
- a plurality of second adjacent facets formed in the upper half, each second adjacent facet forming a second groove extending from the girdle to a distance from the culet, each second adjacent facet provided within a respective half facet,
- wherein the plurality of first adjacent facets and the plurality of second adjacent facets do not abut one another and are arranged in an alternating arrangement,
- wherein the first groove and the second groove each extends inwards in a V-shape.
4 more elements
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Dependencies are inferred from the claim text.