MY159970A - Cushion shaped hearts and arrows gemstone and method - Google Patents

Abstract

A CUSHION CUT DIAMOND AND METHOD FOR POLISHING A DIAMOND TO FORM A CUSHION CUT WHICH WILL DISPLAY A HEARTS AND ARROWS PATTERN CHARACTERISTIC OF THE TRUE HEARTS AND ARROWS PATTERN IN A ROUND CUT DIAMOND WHEN SUBJECTED TO LIGHT. THE CUSHION CUT IS FORMED BY POLISHING A DIAMOND INTO A SYMMETRICAL ROUNDED SHAPED GEOMETRY HAVING FOUR CURVILINEAR LONG SIDES (10,12,14,16) AND FOUR CURVILINEAR CORNER SIDES (18,20,22,24) OF EQUAL RADIUS WITH THE FOUR CURVILINEAR CORNER SIDES (18,20,22,24) INTERCONNECTING THE FOUR CURVILINEAR LONG SIDES (10,12,14,16) TO FORM THE ROUNDED SHAPE; FORMING 4 MAIN CROWN FACETS (MCF1, MCF2,MCF3, MCF4) OF SUBSTANTIALLY EQUAL GEOMETRY AND DIMENSION ON THE FOUR LONG SIDES OF THE DIAMOND AND 4 MAIN CROWN FACETS (MCF5, MCF6,MCF7, MCF8) OF AN EQUAL GEOMETRY AND DIMENSION ON THE FOUR CORNER SIDES WITH THE MAIN CROWN FACETS (MCF5,MCF6,MCF7, MCF8) ON THE CORNER SIDES BEING SUBSTANTIALLY DIFFERENT IN GEOMETRY AND SIZE FROM THE FOUR MAIN CROWN FACETS (MCF1. MCF2, MCF3,MCF4) FORMED ON THE LONG SIDES; FORMING A SUBSTANTIALLY SQUARE SHAPED TABLE FACET WITH FOUR CUT CORNERS ADJACENT TO THE 4 MAIN CROWN FACETS (MCF5,MCF6,MCF7, MCF8) ON THE CORNER SIDES; FORMING 8 CROWN STAR FACETS (α1- α8) ON THE MAIN CROWN SIDES ADJACENT THE SQUARE SHAPED SIDES OF THE TABLE FACET; 16 CROWN HALVE FACETS (β1- β16) SURROUNDING THE FOUR LONG SIDES AND FOUR CORNER SIDES OF THE DIAMOND; 8 MAIN PAVILION FACETS (MPF1-8), 16 PAVILION HALF FACETS (PHF1-16), 4 SUBSIDIARY PAVILION FACETS (SPF1-4), 16 SUBSIDIARY PAVILION HALF FACETS (SHF1-16) AND MULTIPLE GIRDLE FACETS ON BOTH THE LONG AND CORNER SIDES OF THE DIAMOND WITH THE GIRDLE FACETS BEING OF VARYING THICKNESS.