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Title:
DECORATIVE JEWEL AND METHOD FOR CUTTING DECORATIVE JEWEL
Document Type and Number:
WIPO Patent Application WO/2010/035741
Kind Code:
A1
Abstract:
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.

Inventors:
MATSUMURA Tamotsu (2-13-2, Teraodai Ayase-sh, Kanagawa 37, 〒2521137, JP)
松村 保 (〒37 神奈川県綾瀬市寺尾台二丁目13番2号 Kanagawa, 〒2521137, JP)
KAWABUCHI Yoshinori (Inc. 1-20-17, Ginza, Chuo-k, Tokyo 61, 〒1040061, JP)
Application Number:
JP2009/066512
Publication Date:
April 01, 2010
Filing Date:
September 24, 2009
Export Citation:
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Assignee:
Hohoemi Brains, Inc. (1-20-17, Ginza Chuo-k, Tokyo 61, 〒1040061, JP)
株式会社ほほえみブレインズ (〒61 東京都中央区銀座一丁目20番17号 Tokyo, 〒1040061, JP)
MATSUMURA Tamotsu (2-13-2, Teraodai Ayase-sh, Kanagawa 37, 〒2521137, JP)
松村 保 (〒37 神奈川県綾瀬市寺尾台二丁目13番2号 Kanagawa, 〒2521137, JP)
International Classes:
A44C27/00
Attorney, Agent or Firm:
HASEGAWA Yoshiki et al. (SOEI PATENT AND LAW FIRM, Ginza First Bldg. 10-6, Ginza 1-chome, Chuo-k, Tokyo 61, 〒1040061, JP)
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