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Article

Optical Effects of Phenomenal Cabochons

Sharon Bohannon, November 11, 2016

Learn how the structure, inclusions and properties of some gemstones interact with light to create unusual visual effects.

Article

Gems and Minerals from the Sub-Arctic

Sharon Bohannon, March 17, 2017

Circumnavigate the boreal reaches of the globe to explore gems from polar regions.

Article

Dreamy Drusy: Minute Crystals Shimmer in Dramatic Designs

Sharon Bohannon, March 16, 2018

Drusy jewellery has surged in popularity in recent years. Celebrities wear it on the red carpet and designers clamour for it at gem shows.

Causes of Iridescence in Natural Quartz

Xiayang Lin and Peter J. Heaney, May 8, 2017

Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.

Chrysoberyl from the New England Placer Deposits, New South Wales, Australia

Karl Schmetzer, Franca Caucia, H. Albert Gilg, and Terrence S. Coldham, April 28, 2016

Examines a collection of chrysoberyl samples from these sapphire placer deposits to determine their distinct mineralogical and chemical properties.

Optimising Face-Up Appearance in Coloured Gemstone Faceting

Al Gilbertson, July 24, 2013

How contrast patterns can increase perceived brightness and optimise a gemstone's appearance.