| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a decagonal shaped diamond, adapted to display a hearts and arrows pattern when exposed to light comparable to the hearts and arrows pattern in a round diamond.SOLUTION: The decagonal shaped diamond is cut to form: ten main crown facets of substantially equal size symmetrically arranged relative to one another surrounding a table facet; twenty star facets with two star facets polished on every main crown facet; ten main pavilion facets; an equal number of crown half facets as pavilion half facets; ten subsidiary pavilion half facets; twenty subsidiary pavilion facets; and ten main girdle facets with the girdle facets polished at a given angle relative to one another for forming the decagonal shape of the diamond.</p> |
