Emeralds & Other Beryls by John Sinkankas

Emerald and Other Beryls by Captain John Sinkankas (1981) is widely regarded as the definitive, ultimate reference work on the beryl mineral group. Written by one of the most respected gemologists and lapidary authors of the 20th century, it remains a monumental text for gemologists, mineral collectors, and jewelers.

Author: Captain John Sinkankas (USN Ret., C.G.), renowned gemologist, author, lapidary artist, and founder of Peri Lithon Books.

Publisher & Year: Chilton Book Company (1st Edition: 1981); reprinted by Geoscience Press.

Format & Size: Hardcover (cloth with dust jacket), large format, 665 pages. Richly illustrated with color plates, black-and-white photos, structural diagrams, and locality maps.

Core Subject: An exhaustive monographic study of emerald, aquamarine, morganite, heliodor, goshenite, and red beryl (bixbite).

Key Topics Covered:
Crystallography & Physical Properties: Crystal habits, optical constants, color mechanisms, inclusions, and physical characteristics of beryls.

Geochemistry & Formation: Geological environments, host rocks, pegmatites, and hydrothermal vein systems where beryl crystallizes.

World Localities: A thorough geographical breakdown detailing every major and minor deposit worldwide (including Colombia, Brazil, Russia/Ural Mountains, Zambia, Madagascar, and North America).

Gemological & Historical Aspects: History of beryl mining, famous historical emeralds, synthetic beryl production methods, enhancements/treatments, and lapidary cutting considerations.

Because of its status as an essential reference book, original hardcover editions in excellent condition maintain high value

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