The Opal is truly the "Queen of Gems" and the Eve of the Gods. There are two categories of opals - common and precious. The Precious opals are composed of three groups: white, black, and fire opal. Fire opal helps relieve energy deficiencies; stimulates sexual organs and the adrenal glands. Opals are a good choice for metabolism problems and fatigue. Opal is a good memory aid. Opal is the stone of great achievement. Opal is a good stone for writers. Opal assists in letting go of anger. It is said to be the stone of love, but only to faithful lovers.