There are many colors of corundum. Среди них, the red corundum is the gem Ruby, which is the most expensive among colored gemstones, so it is regarded as the “Король драгоценных камней”; blue corundum is the sapphire we know as Sapphire, and other colors of corundum are also pink Color, фиолетовый, желтый, апельсин, зеленый, и т. д.. […]
