Handy Pocket Guide to Asian Gemstones (Periplus Nature Guides)
Publisher: Periplus Editions
Published: March 2004
Language: eng
Format: Paperback
Number of pages: 64
ISBN-13: 9780794601898
Subjects: Gems; Reference; Crafts & Hobbies; Nature; Hobbies/Crafts; ASIA; Rocks & Minerals
First sentence: One of the most durable of gems-second in hardness only to diamond-the ruby is a crystalline form of aluminium oxide, infused with trace elements of chromium which gives the gemstone its red color.