Sharon Bohannon, November 11, 2016
Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.
Read MoreRonald J. Spencer, Alfred A. Levinson
The distinctive orange-to-red “fire" opals from Querétaro have not been found in significant quantities at any other locality.
Read MoreMartina Simoni, Franca Caucia, Ilaria Adamo, and Pietro Galinetto
Twenty-two gem opals from a new volcanic deposit located near Bemia
Read MoreBrendan M. Laurs, Thomas W. Overton
This article, from the Winter 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read MoreDona M. Dirlam
This article, from the Winter 1991 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.
Read MoreJohn I. Koivula, Chuck Fryer, June 1, 1983
An examination of play-of-colour opal from Mexico and its variety of inclusions.
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