Describes how crystals form in nature, how crystals are grown artificially, and how crystals are used in industry. Numerous color photos with text identify the various gemstones. "Discover the beauty of emeralds, rubies, lapis lazuli, jade, silver, and gold in this glittering collection of precious stones and metals. Learn where crystals can be found, how they form, and what they are used for--from dazzling jewelry to diamond-cutting tools and the...