DIAMOND OF IMPROVED RECTANGULAR DIAMOND CUT Russian patent published in 2008 - IPC A44C17/00 

FIELD: jewelry.

SUBSTANCE: diamond of rectangular cut has beveled facets. Each of said beveled facets adjacent to four apexes of crown has fracture extending along diagonal line parallel to belt so as to form facet configuration wherein beveled facet is divided into lower beveled facet and upper beveled facet. Upper angle of upper beveled facet crown may be made smaller than angle of lower beveled facet crown and, accordingly, even without altering of crown height, so that sign of facet is slightly smaller. Deviation angles of star facets and of second beveled facets from horizontal plane, provided that both are capable of intensive reflection, may be made small, and areas of these facets may be made large. Thus, all reflection patterns become similar in size to the extent that is preferable for visual perception. By making star facets and second beveled facets so that they have small angle of deviation from horizontal plane, extremely intensive reflection may obtained and increased areas of star facet and second beveled facets may be provided. This allows cut to be provided, which is characterized by extremely intensive reflection (the number of visually perceptible beam reflections).

EFFECT: improved rectangular diamond cut by providing optimal shape of facet configuration for increasing the number of visually perceptible reflected beams.

10 cl, 19 dwg