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Which is more authoritative, grc jewelry certificate or gis?
Grc certification body.

The most authoritative certificate in China is the national inspection certificate, namely GRC certificate. The standard and description of each certificate are slightly different, but they can all be used as the official certification of sapphire grade. Sweden's GRS certificate is the most authoritative sapphire in the world, in addition to AGS, FGA, AGL, Lotus, GCGI and EGL.

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