""There's no value for diamond, we make it value."——给钻石鉴定评级的客户如是说 比如说colour，一般分成D/E/F/G/H...。D自然是顶级，但市场上多半是F/G/H，更劣的M/N/N-也不少。 再说Quality，细分成FL/I1/I2/.../S1/.../V..."
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