Study on Colorimetry of Ruby

According to the principle of colorimetry,the color parameter indexes of ruby are quantitated by the USB2000 + fiber spectrometer. The color of ruby can be distinguished by means of the complementary wavelength and hue angle: When the hue angle in 0°-18° and the complementary wavelength is 490-496nm,ruby's hue is red; when the hue angle in 342°-360° and the complementary wavelength is 497-509 nm,ruby's hue is pink; when the hue angle in 324°-342° and the complementary wavelength is 509-542 nm,ruby's hue is purple red; when the hue angle in 306°-324° and the complementary wavelength is 542-570nm,ruby's hue is purple. Therefore,it can objectively and quantitatively describe the color of ruby by using the fiber-optic spectrometer and the appropriate method of lighting and spectrum collection,and it also can be used as the adaptable technique of evaluating the color of ruby.