This Sapphire is typical in appearance of the Australian Sapphire. The green and yellow colors together are called Parti colored Sapphires.
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.