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...minerals in the trigonal crystal system. In the gem world, all colors of gem-grade corundum other than rubies are called sapphires. The main component of sapphire is alumina (Al2O3). Corundum contains ......
...hole Hand Sewing Drill Flatback Crystal Stones Premium crystal stones for wedding accessories, dress handicrafts, and more. Enhance your designs with these exquisite oval-shaped, double-hole flatback crystal...