Current location - Plastic Surgery and Aesthetics Network - Jewelry brand - Have you ever heard of GTC (Jewelry Testing Center of China Federation of Industry and Commerce)? How credible and authoritative is it? Is the diamond it identifies reliable?
Have you ever heard of GTC (Jewelry Testing Center of China Federation of Industry and Commerce)? How credible and authoritative is it? Is the diamond it identifies reliable?
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GTC's website

This institution is ok. There is little difference in diamond identification and the standards are relatively clear.

If it is jade, it's hard to say. Maybe the results of different appraisal institutions for the same piece of jade are very different.

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