Explanation

corundum gems in other colors except mby, including white sapphire, green sapphire, etc. Rich in color, colorless when pure, it can be colored when there are trace elements in the lattice: Cr and Ni combine to cause orange or golden yellow, Ti and Fe combine to cause purple or blue, Ni causes yellow, Co, V, Ni combine to cause green, etc. sapphire is mainly produced in Myanmar, Thailand, Sri Lanka, Cambodia, India, Australia and the United States. sapphire in China is mainly produced in Changle County and Wuge County in Weifang, Shandong Province. See corundum.

Classification