Gemstones of the World  (English, Hardcover, Schumann Walter)

"Gemstones of the World" is truly the single volume that every hobbyist, jeweller, jewellery maker and rockhound needs: it's the cornerstone of the field. And this updated edition contains a host of new findings on "Gemstones for Collectors," additional gems in the "Table of Constants" and the "double fraction" figures that experts have long wanted - a very special new feature. Over 1,500 full-colour photographs showcase stones in their rough, natural, and polished & cut renditions. Charts and tables help collectors identify unknown gemstones and check for genuineness.