There are many colors of corundum. Aralarında, the red corundum is the gem Ruby, which is the most expensive among colored gemstones, so it is regarded as the "Mücevher Kralı"; blue corundum is the sapphire we know as Sapphire, and other colors of corundum are also pink Color, mor, sarı, turuncu, yeşil, vesaire. [...]
