If you have a certificate, it's easy to do. If you are not at ease, go to the place where the certificate is issued and re-examine it yourself.

Generally, the phone number and address of the appraisal institution will be printed on the back of the domestic certificate.

But according to what you said, gem ring spent more than 400 yuan to buy this silver ring holder, so 90% of the sapphire on it is real, because silver is worthless, and the price of sapphire varies greatly according to the quality, ranging from thousands to tens of dollars.