Article Search Results

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.

A face-up view of a cushion cut diamond with blue color.

Article

Gems & Gemology’s 7 Most Unusual Encounters from 2019

Stuart Overlin, Brooke Goedert and Kellie Giordano, December 13, 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

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.

Raman analysis identified the horse-shaped inclusion as phlogopite mica.

A Horse-Shaped Inclusion in Pink Sapphire from Mozambique

Charuwon Khowpong, August 9, 2018

Microscopic examination of a Mozambican pink sapphire reveals an inclusion with a surprising shape and composition.

Suite containing over 36 carats of Yogo sapphire

Gemmological Characterisation of Sapphires from Yogo Gulch, Montana

Nathan D. Renfro, Aaron C. Palke, and Richard B. Berg, August 6, 2018

A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.

Violetish blue spinel inclusion in sapphire.

Violetish Blue Spinel in Yellow Sapphire

Nathan Renfro and John I. Koivula, February 1, 2016

A singly refractive inclusion within a yellow sapphire proves to be spinel.

A Fantastic Display of Phase Changes in a Sapphire’s Fluid Inclusion

Nathan Renfro, John I. Koivula, and Elise A. Skalwold, April 28, 2016

Phase changes illustrate the temperature and pressure conditions in the fluid inclusion system of a Sri Lankan sapphire.

Article

Autumn 2016 G&G: CVD Synthetic Diamonds Survey, Reversible Colour Change in Blue Zircon

Jennifer-Lynn Archuleta, October 31, 2016

A summary of the content found in the Autumn 2016 issue of Gems & Gemology.

Article

New Nigerian Source of Blue Sapphire

Vincent Pardieu, Supharart Sangsawong, Jonathan Muyal, Nicholas Sturman, August 22, 2014

A preliminary report on blue sapphires from a new deposit in Nigeria's Mambilla Plateau.

A study of the gems in ciborium from Einsiedeln Abbey

Stefanos Karampelas, Marie Wörle, Katja Hunger, Hanspeter Lanz, Danilo Bersani, and Susy Gübelin

The gemstones that adorn a late-16th-century ciborium from Einsiedeln Abbey in Einsiedeln, Switzerland.

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