
Sapphire is September's birthstone. Sapphire, a variety of corundum, exists almost in any color. Color of sapphires is the main factor for price estimation. Heat treatment is usually applied to improve color and reduce small inclusions. Sapphire has a Hardness of 9, making it the hardest gem next to diamond. Sapphire is found in Thailand, Burma, Sri Lanka, India, Madagascar, Kenya, Tanzania, Cambodia, China, Australia, and USA.