This is a beautiful yellow Sapphire from Sri Lanka that hasn’t been heated or treated in anyway. The color is very unique for a yellow Sapphire.
The sapphire is one of the two or three gem-varieties of corundum, with another one being the red or deep pink ruby. Although blue is their most well-known color, sapphires are made up of any color of corundum except for red. Sapphires may also be colorless, and they are also found in shades of gray and black