Perhaps no gem delights the senses like the diamond. This most precious of stones seems to burn with a fire deep within. Crystallized carbon, formed under tremendous pressure over millennia, the diamond is famed for its everlasting hardness. In this capacity, the gem has come to symbolize eternal faithfulness and is the traditional focus of the engagement band. Because early cultures lacked the technology to facet the diamond, the gem has only become popular in the last two centuries. Diamonds are normally colorless, but they are also found in shades including yellow, pink, and blue. In eastern belief, the diamond is said to enhance the full spectrum of energies in the body, mind, and spirit. Within the circle of gems, the diamond defines the standards of beauty, rarity, and preciousness.