#jewelleryfacts365 319/365 Diamond fact

Cubic zirconia (CZ) is the synthesized material is hard, optically flawless and usually colorless, but may be made in a variety of different colors. Its commercial production began in the USSR in 1976. In 1977 cubic zirconia begun to be mass-produced in the jewelry marketplace. By 1980 annual global production had reached 50 million carats (10 tonnes). [source]

Color grading a white diamond is really about the absence of color. Any hint of color lowers the value of the diamond, and the stronger the color, the lower the gem's worth. The color grading scale established by GIA, and recognized around the world, has letter grades to describe the increasing presence of color.