There are many colors of corundum. Trong số đó, the red corundum is the gem Ruby, which is the most expensive among colored gemstones, so it is regarded as the “Vua đá quý”; blue corundum is the sapphire we know as Sapphire, and other colors of corundum are also pink Color, màu tím, màu vàng, quả cam, màu xanh lá, vân vân. […]
