| 摘要 |
The color stone 1 is formed of a material with a refractive index n of 1.55 to 2.40, and is subjected to round brilliant-cutting. The pavilion angle p and the crown angle c satisfy the correlation of, −A(n)×p+B(n)+K1≧c≧−A(n)×p+B(n)+K2 where, A(n) is represented by A(n)=−1.122×n5+9.14×n4−26.752×n3+32.982×n2−12.842×n, B(n) is represented by B(n)=−22.323×n5+184.166×n4−527.616×n3+594.102×n2−128.68×n, K1 is represented by K1=+4, and K2 is represented by K2=−4.
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