A classic book gets a new, redesigned, and sumptuous edition in celebration of its 25th anniversary. Updated and revised, Gems & Crystals showcases the museum's renowned collection and unlocks the science behind the dazzling properties of each gemstone species. Nearly 150 key varieties of gems and minerals are profiled, with information on their history, lore, and sources, as well as the relationships among the bewildering variety of crystals, minerals, rocks, and gemstones. Extensively researched and stunningly illustrated, this very special volume will fascinate novice and expert alike.