Cut design of diamonds providing plenty of...

Details Cut design of diamonds providing plenty of... Cut design of diamonds providing plenty of...

2007-07-31

2007-07-31

Lavinder, Jack W. (Department: 3677)

Jewelry

Miscellaneous

C063S032000

Reexamination Certificate

active

11087917

ABSTRACT:
A cut design of an ornamental diamond and an observation method of the diamond which an observer can perceive a more beauty, are disclosed. The cut design is a round brilliant cut comprising a girdle, a crown above the girdle and a pavilion below the girdle. A girdle height (h) is 0.026 to 0.3 times a girdle radius, a pavilion angle (p) of a pavilion main facet ranges from 37.5 degrees to 41 degrees, and a crown angle (c) of a crown main facet is within a range of satisfying: c>−2.8667×p+134.233 and p<1/4×{(sin−1(1
)+sin−1(1
·sinc))×180/π+180·2c}, wherein n: refraction index of a diamond, π: circular constant, p: pavilion angle in degrees, and c: crown angle in degrees. The cut design of the ornamental diamond provides an observer with plenty of visual-perceptible reflection when the observer watches the diamond above a table facet with a sight line of an angle less than 20 degrees with a vertical line at the center of the table facet.

REFERENCES:
patent: 6397832 (2002-06-01), Shuto
patent: 6474102 (2002-11-01), Buerger
patent: 6694778 (2004-02-01), Kawabuchi et al.
patent: 6990833 (2006-01-01), Smith

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