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US 7,000,607 B2Granted
Gemstone and corresponding method of cutting
OwnerOfer Davidiinventor
Life of this patent
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Abstract
A gemstone having a crown, a girdle and a pavilion, wherein the girdle is shaped such that, when viewed in plan view, it is primarily bounded by four pairs of parallel straight edges. Three of the four pairs of edges are spaced by roughly equal spacing D1, while the remaining pair of edges is spaced by a spacing D2, wherein D2 is greater than D1 by between 10% and 40%. Also provided is a method for cutting such a gemstone.
Claims9
A method for cutting a gemstone from a block of gemstone material, the block having an initial shape corresponding substantially to a pyramid having a square base, the method comprising:
- (a) processing the block to generate two pairs of girdle edges lying on a square of side D1, where D1 is substantially equal to the length of a side of the square base of the block;
- (b) removing material from a first pair of diagonally opposing corners of the block substantially adjacent to the base so as to generate a third pair of girdle edges separated by a distance substantially equal to D1;
- (c) removing material from the second pair of diagonally opposing corners of the block substantially adjacent to the base so as to generate a pair of girdle edges separated by a distance D2, wherein D2 is greater than D1 by between 10% and 40%;
- (d) shaping the base of the block to form a plurality of crown facets;
- and
- (e) shaping the pyramid to form a plurality of pavilion facets, thereby forming an ornamental gemstone having a girdle substantially bounded by said pairs of girdle edges.
3 more elements
Dependencies are inferred from the claim text.