Title:
COLOR GRADE DISCRIMINATING REFERENCE STONE FOR DIAMOND
Document Type and Number:
Japanese Patent JPS5838843
Kind Code:
A
Abstract:
PURPOSE: To enable a relatively easy production of a color grade discrimination reference stone and a universal discrimination of diamond by employing cubic zirconia (ZrO2) for the stone.
CONSTITUTION: A small amount of a transition metal oxide or a rare earth oxide is added to a cubic ZrO2 to form a product comparable to the color grade of a natural diamond reference stone. This facilitates the discrimination of the color grade without requiring any costly natural product.
Inventors:
ISOMURA MASAYUKI
Application Number:
JP13663581A
Publication Date:
March 07, 1983
Filing Date:
August 31, 1981
Export Citation:
Assignee:
ISOMURA MASAYUKI
International Classes:
G01N21/87; (IPC1-7): G01N21/87
Attorney, Agent or Firm:
Makoto Iizuka