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crimson colored jewelry crystals wholesale GIA is the abbreviation of Institute of America. Founded in 1931, it was the earliest institution that systematically proposed the diamond "4C" hierarchical rules. Since 1953, the GIA diamond grading rules have been used by diamond merchants, appraisal agencies and retailers for 50 years. During this period, this provision has been revised and improved, and it has become more reasonable. Its purpose is to provide stability. The precise grading conclusion is also the quality grading standards that the industry has been pursuing for a long time.

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The characteristics can be summarized as the following points:

① The color grading uses simple and clear D — Z alphabet in order to indicate that diamonds are not available in order. The color level of color to color replaces vague term;

② clarity grading is more detailed, and the European "mirror no time" level is divided into "no time" and "internal internal" There is no time to "two levels;

③ Inner and external defects in the diamond clarity classification, especially in the judgment of" no time "diamonds, the effect of external flaws is more significant;

④ Cutting grading comprehensive measurement and evaluation from the aspects of proportion, polishing and symmetry. It has made a major contribution to the unified diamond classification standards.