This blue gemstone is the most wanted gems in the world. Many collectors prefers to collect this blue gems,  well known Sapphire, as their precious collections. The sapphire is belonged to gems family of corundum, red corundum called  ruby and then a pinkish orange variety called padparadscha. Despite the fact that blue is the most well-known color for sapphire, this kind of corundum can even be colorless, and are also present in many colors including yellow, green, milky white, gray and black. Is it already accepted by many gemologists that all corundum minerals except red are called as Sapphire.

The price of natural sapphires may differ determined by their color, clarity, size, cut, and general quality, combined with the geographic origin. Well known sapphire deposits tend to be found in Thailand, Ceylon Sri Lanka, Madagascar, Eastern Australia, Africa, also in some area of North America, but mostly are found in Montana. Sapphire and rubies in many cases are found together within the same area.

Sapphire corundum in many cases shows asterism effect, usually six rays star. This asterism phenomena is coming from the small rutile inclusion that present inside the gems. The star effect brought on by the dense inclusions of tiny fibers of rutile, known as "silk inclusion or rutile inclusion". But the truth is, since rutile is obviously included in star sapphire, the body of the sapphire is  very rarely transparent.