There are two main types of ruby ​​primary deposits: 1 formed under the high temperature and high pressure conditions of the mantle, and the surface is sprayed with the magma; 2 is metamorphosed by a diaspore under the action of regional metamorphism or contact metamorphism. Famous places of origin include Myanmar, Afghanistan, Pakistan, Tanzania, Australia, Thailand, Cambodia, and Vietnam.
In China, Yunnan, Anhui, and Qinghai also have a certain quality of ruby ​​output. Although there are many places of production, due to the limited natural resources and the increasing demand for rubies as the economy develops, natural rubies are increasingly unable to meet people's needs, so the optimized treatment and synthetic ruby ​​came into being. Although the emergence of artificial gemstones on the one hand solved the ever-increasing contradiction between supply and demand in the market, on the other hand, it has brought a big impact on the jewelry market, affecting the normal and orderly operation of the ruby ​​market.
Therefore, effective jewellery identification work seems to be more important. Cathodoluminescence technology, as a non-destructive testing method, has been widely used in the testing and research of gemstones in recent years. It can be used not only to distinguish between natural and synthetic diamonds, but also to identify natural and synthetic emeralds, natural jade and Handle jade and synthetic red sapphires.
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