Discovery of Colour-Change Chrome Grossular Garnets from Ethiopia
The first known group of colour-change gem-quality chrome grossular garnet, reportedly from Ethiopia, is examined in GIA’s Carlsbad lab.
D-Colour Natural IIa Diamond with Walstromite Inclusion
A diamond is proven to have a superdeep origin through an inclusion of CaSiO3-walstromite.
Separating Glass-Filled Rubies Using the DiamondView
The DiamondView instrument is able to identify glass as the filler in a pair of heart-shaped rubies.
Update on Trace-Element Chemical Characteristics of Golden Sheen Sapphire
An update the gemmological and chemical characteristics of golden sheen sapphires from Kenya.
Gemstones and Sustainable Development Knowledge Hub
Projects developed by the GemHub to benefit miners, cutters, and others involved in the gem and jewellery industry.
Nephrite Bracelet with Filled Cavity
A jade bracelet contains unusual fillers, used to create a smooth surface.
IAC Conference on Responsible Gold
A report from the eighth annual International Gold Conference, held in New York on 12-13 April 2018.
Gemstone Guidebook Project
A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.
Green-Blue Maxixe-Type Beryl
A transparent greenish-blue pear-shaped gemstone, reportedly from Madagascar, is discovered to be a Maxixe-type beryl.
Strong Fluorescence in B-Jade Impregnated with Wax
A bangle is an example of the misconception that B jade is only impregnated by resin, when in fact wax-impregnated jadeite is also considered B-jade.