Blue sapphires
A large portion of the world's sapphires come from Madagascar. However, this gem is also mined in Thailand, Burma, China, Kashmir, Cambodia, Sri Lanka and Tanzania. One of the four most precious stones, sapphire is a corundum, a hexagonal aluminum oxide.
The sapphire is a traditional September birth stone. Birthday gems associates it with healing, clairvoyance and peace of mind.
The word sapphire comes from the Greek for blue stone; however, according to Collins Dictionary, it may be traced back to Hebrew and before that to Sanskrit, in which it meant beloved of the planet Saturn.