Gemstone

The terms gemstone or gem can refer to any of the following:
 * One of the four rare crafting materials named after gemstones:
 * Diamond
 * Ruby
 * Sapphire
 * Onyx Gemstone, found only in the Eye of the North expansion
 * One of the four types of Anguish Gemstone found in the Domain of Anguish:
 * Margonite Gemstone
 * Stygian Gemstone
 * Titan Gemstone
 * Torment Gemstone