Ruby is a precious stone and a member of the corundum family (Al2O3). Named from the Latin word for its hue, ruber, ruby is the epitome of the boldest of colors: the gem of desire, passion, courage, and emotion. Ruby was said to be the most precious of the twelve stones God created when he created all things and this 'lord of gems' was placed on Aaron's neck by God's command. The bible says that wisdom is 'more precious than rubies,' that is to say very valuable indeed. In the ancient language of Sanskrit, ruby is called ratnaraj, or 'king of precious stones' and ratnanayaka, 'leader of precious stones.' The most important factor in the value of a ruby is color.