Thought as the stone in which the Ten Commandments were carved, folklore states the stone will not shine when worn by the wicked

Sapphire is of the mineral corundum. It owes its deep blue color to a small mixture of iron oxide and traces of titanium oxide. Because of its hardness (corundum is the hardest mineral known next to diamond), sapphires are one of the best of all jewelry stones. Clear sapphires have many of the same qualities of the diamond.

The sapphire derives its name from sapphirus, a Latin term meaning blue. As September's birthstone, sapphire has long been honored as a stone of prophecy and wisdom and even called the philosopher's stone.

Legend holds that the wearer of a sapphire can expect enhanced mental clarity, perception, and wisdom.

Specific gravity - 3.96 to 4.0 Hardness - 9.00. They're safe to clean in ultrasonic cleaners.