The best way is to identify it. Certificates are not very expensive. A piece of tens of dollars can not only measure your gem, but also identify the composition of the metal holder. The most authoritative jewelry and jade testing institution in our country is the National Jewelry and Jade Quality Supervision and Inspection Center, which is located in Beijing. Every province has branches, generally located in the capital city of each province. There are also testing institutions set up by individuals, which can also issue certificates, but they are generally not reliable and will spend money to buy them.

The upstairs answered all the questions, but they were all instrument identification. I don't think you have such an instrument, otherwise you wouldn't ask. You didn't give the picture, and we couldn't see the real thing, so we didn't show you what it was. But I can tell you some common sense: there are more pearls and some precious stones used by honest officials, and the blue varieties are generally blue spinel and sapphire, while the blue tanzanite is less. Many blue spinels are considered as sapphires. Spinel generally has high purity and good transparency, and there are no inclusions in it, while sapphire is dark and uneven, and there are many inclusions in it.