John Koivula is the world leading authority on inclusions in gemstones; Phototalas of Inclusions in Gemstones, vols. 1-3, co-authored with Eduard Gubelin, are available from microWorldofGems.com.
John Koivula is the world leading authority on inclusions in gemstones; Phototalas of Inclusions in Gemstones, vols. 1-3, co-authored with Eduard Gubelin, are available from microWorldofGems.com.
An extensive resource on the internal world of gemstones—for the beauty they display and the information they reveal about their identity, origin, and sometimes, treatment.