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A heart-shaped piece of pink drusy hangs from a gold chain.

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.

Iridescence in iris quartz from Jalgaon, India

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.

Multi-colored gems are superimposed on an image of glacier peaks.

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.

Three pieces of labradorite with yellow, blue and green flashes of color.

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.

Reversible Colour Modification of Blue Zircon by Long-Wave Ultraviolet Radiation

Nathan D. Renfro, November 7, 2016

Determines whether blue zircon, inadvertently altered to brown by exposure to long-wave UV radiation, can be restored to its original colour through the use of incandescent light.

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.

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