Cut gem, in particular cut diamond
Patent 6405562 Issued on June 18, 2002. Estimated Expiration Date: 
November 14, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 14, 2020. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod of facetting a gem D384592 D390155 D398552 Gemstones formed of silicon carbide with diamond coating D442880 D447439 InventorsAssigneeApplicationNo. 710836 filed on 11/14/2000US Classes:63/32, GEMD11/89, Jewel, gem or signetD11/90FacetedExaminersPrimary: Lavinder, JackAssistant: Chop, Andrea Attorney, Agent or FirmForeign Patent References
International ClassA44C 017/00Foreign Application Priority Data1999-12-23 CHAbstractThe cut gem, in particular the diamond, has a predetermined number of cut facets in the crown (10) and in the pavilion about a central axis of geometric symmetry. The facets (25 to 27) are disposed about said axis of symmetry in a hexagonal arrangement. This geometric axis of symmetry preferably corresponds to one of the ternary crystallographic axes of the diamond. The girdle (12) separating the crown from the pavilion has a contour (20) of lobed shape with six rounded projecting portions and six rounded hollow portions (21, 22). The gem thus cut permits obtaining the original optical effects of brilliance and dispersion of light.Other References
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