Patent ID: 7225641
Filing Date: 2007-06-05
Classification: A44C

Abstract:
1. A round brilliant cut ornamental diamond with visual-perceptible reflection, the cut diamond comprising: a substantially round or polygonal girdle having an upper horizontal section and a lower horizontal section parallel to the upper horizontal section; a crown above the upper horizontal section of the girdle having a table facet and at least one crown main facet; and a pavilion below the lower horizontal section of the girdle having at least one pavilion main facet, wherein a girdle height (h) between the upper and the lower horizontal sections of the girdle is 0.026 to 0.3 times a girdle radius, a pavilion angle (p) between the pavilion main facet and the lower horizontal section of the girdle ranges from 37.5 degrees to 41 degrees and a crown angle c between the crown main facet and the upper horizontal section of the girdle is within a range of satisfying the following inequalities: wherein n: refraction index of a diamond, π: circular constant, p: pavilion angle in degrees, and c: crown angle in degrees.