What is a good color for a diamond？

The color of a diamond actually refers to the degree of colorlessness

For most gem-quality diamonds, the color identification standard depends on its colorlessness. A diamond with no chemical impurities and perfect structure is like a pure water drop. It has no color and has a higher value. GIA has created the D to Z diamond color grading system, which verifies the colorlessness of diamonds by comparing diamonds with colorimetric stones under precisely controlled lighting and observation conditions.

Although the color difference between diamonds is so subtle that it is difficult for non-professionals to distinguish, it can cause huge differences in diamond quality and price.

• Why does GIA's color grading system start from D?

Before GIA created the D to Z color grading system, there were many other name grading systems on the market, such as English letters A, B, C (not clearly defined when used), Arabic numerals (0, 1, 2, 3) And the Roman alphabet (I, II, III), and the descriptive color terms such as "sapphire blue" or "blue and white" are not uniform, causing consumers' confusion. In view of this, GIA decided to create a new color grading system, which has nothing to do with the earlier system. The GIA rating system starts with the letter D. Because GIA's grading system was clear and clear, it was quickly accepted by the public, and other grading systems were gradually abandoned.

• In diamond grading, is the z-level considered "color"?

Natural colored diamonds outside the normal color range are called "colored diamonds". In the United States, the Federal Trade Commission (FTC) does not provide any guidelines for the use of the term "colored", but there is a consensus in international trade that colored diamonds are yellow or brown diamonds that are darker than the color of the Z-grade colorimetric stone, or It is a diamond with a color other than yellow or brown.