On its 25th anniversary, a classic book gets a sumptuous, redesigned edition. Fully updated, 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. Extensively researched and stunningly illustrated, this special volume will fascinate novice and expert alike.