DECORATIVE JEWEL AND METHOD FOR CUTTING DECORATIVE JEWEL

摘要

A color stone (1) is formed of a material having a refractive index n of 1.55 to 2.40 and has been subjected to round brilliant cutting. In the color stone (1), a pavilion angle p and a crown angle c satisfy a correlation of -A(n) × p + B(n) + K1 = c = -A(n) × p + B(n) + K2, wherein A(n) = -1.122 × n5 + 9.14 × n4 - 26.752 × n3 + 32.982 × n2  - 12.842 × n; B(n) = -22.323 × n5 + 184.166 × n4 - 527.616 × n3 + 594.102 × n2 - 128.68 × n; K1 = +4; and K2 = -4.