The examination certificate of China Geo University is more reliable.

You only need a check code to query.

It should be genuine, don't worry.

S925 amethyst pendant has strong homogeneity.

This price is a bit deficient.

Go to Taobao to search for similar goods and compare the prices yourself.

A discount below 10% is the best.

Hope to have some reference, just ask not to use URL link.

Good luck!