GILC and LMHC decisions for Hydrophane opal nomenclature

NomenclatureAnthony SmallwoodMay 4, 2021

Opal Historical SA Trade standards (1979)

The article in this issue of the Australian Gemmologist was for its time a ”land breaking” discussion on opal nomenclature.

NomenclatureAnthony SmallwoodApril 30, 2021

An Opal Terminology

NomenclatureAnthony SmallwoodAugust 13, 2020

The World of Opals

The world of opal written by Allan Ekert and published in 1997 by John Wiley and Sons, Inc. ISBN 0-471-13397-3 contains a wonderful Appendix of a Glossary of opal terms.