I bought a diamond ring in Russia. But I don't know what it means. 1/2A 1/3A means that the purity is high or bottom? How much is this in China. Ask for expert advice. thanks
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Is there a certificate with GIA? If not, it is recommended that you go to a nearby national testing station and test it. After that, there will be a clear concept, so that it will be well valued (the price can be done within a day within 100).
This is just the information about the gravel ~ Diamond depends on its 4C