The essence of grades standard is gem cutting database - processing rules system, for cutting data determines cutting quality.
评级标准的实质就是切割数据，因为切割数据决定着切工品质。
The essence of grades standard is gem cutting database - processing rules system, for cutting data determines cutting quality.
评级标准的实质就是切割数据，因为切割数据决定着切工品质。
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