Chrysoberyl gemstones
Patent 4306427 Issued on December 22, 1981. Estimated Expiration Date: 
October 15, 1999. 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.
October 15, 1999. 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 References D35938 D36142 D59297 3835665 Brilliantized step cut stone Patent #: 4118949 InventorApplicationNo. 06/084706 filed on 10/15/1979US Classes:63/32GEMExaminersPrimary: Shay, F. BarryAttorney, Agent or FirmInternational ClassA44C 17/00 (20060101)AbstractA chrysoberyl gemstone cut in a modified brilliant style is provided. The gemstone has seven rows of facets, including a girdle comprising rectangular facets. Each row contains eight, ten or twelve facets. The bottom row of facets is visible as a rosette pattern when the gemstone is viewed through the table.Other References
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