Cuprian Liddicoatite Tourmaline
Characteristics of Gem-Quality By-Product Synthetic Zincite
Investigates the properties of synthetic zincite produced by industrial kilns in Poland.
An Inside Look at the 2017 Tucson Shows
An overview of the trends reported at the 2017 Tucson gem shows.
Causes of Iridescence inNatural Quartz
Describes the occurrence of iridescence, and the role of differential etching, in quartz crystals from India’s Jalgaon District.
Brazilian Diamonds: A Historical and Recent Perspective
Recounts the history, geology, and notable localities of diamond mining in Brazil, and outlines plans for future diamond production.
Pyrope-Spessartine Color-Change Garnet with a High Grossular Component
A color change in rough garnet is observed and plotted in GIA’s Carlsbad lab.
Exceptional Freeform Tanzanite and Oregon Sunstone Rings
A family sources, designs, and carves gems for extraordinary jewelry and pieces.
Magnificent Sapphires from Montana’s Rock Creek Mine
A look at the 2016 sapphire production from Montana’s Rock Creek deposit.
Negative Crystals in Sapphires
Sapphires from Baw Mar host multiphase inclusions in appealing patterns.
Unusual Dark Orangy Red Cordierite
A cordierite with a color not seen in the GIA lab is examined in New York.
New Designs from Paula Crevoshay
World-renowned jewelry artist Paula Crevoshay displays some of her newest pieces at the Tucson gem shows.
Importance of the Secondary Market for Fine Gems
Exceptional gems that are recirculated in the gem market make an impact at the Tucson shows.
Gem Paintings from Thailand
Fine Gems and Update from Myanmar
Ethical and Sustainable Vertical Integration in the Sapphire Market
The recession of 2008 transforms a gem business into a vertically integrated operation.
Emerald Dealing in Afghanistan
Cultured Pearl Market Update
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