Article Search Results

A miner in northern Tanzania examines rhodolite.

Gemstone Guidebook Project

Jennifer-Lynn Archuleta, August 9, 2018

A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.

Garnets under daylight-equivalent (left) and incandescent light (right).

Discovery of Colour-Change Chrome Grossular Garnets from Ethiopia

Ziyin Sun, Aaron C. Palke, Nathan D. Renfro, Heidi Breitzmann, Dylan Hand, and Jonathan Muyal, August 9, 2018

The first known group of colour-change gem-quality chrome grossular garnet, reportedly from Ethiopia, is examined in GIA’s Carlsbad lab.

Spring 2000 Gem News International

March 1, 2000

A compilation of gem news from around the world, covering topics such as localities, unusual gem materials, market news, new products, discoveries, jewellery manufacturing techniques and industry trends.

Pyrope-Spessartine Colour-Change Garnet with a High Grossular Component

Ziyin Sun, Jonathan Muyal, and Aaron Palke, May 8, 2017

A colour change in rough garnet is observed and plotted in GIA’s Carlsbad lab.

A selection of demantoid from Namibia’s Green Dragon mine.

Large Namibian Demantoid Garnet

Duncan Pay, July 31, 2015

The Green Dragon mine yields exceptional demantoid, including a round brilliant seen at Tucson’s GJX show.

Mexican Demantoid from New Deposits

Mikhail Ostrooumov, February 1, 2016

Skarn deposits in the Veracruz state of Mexico yield new demantoid material.

Green Nephrite Jade Attracts Buyers in Tucson

Tao Hsu, July 31, 2015

An update on the nephrite jade market from the 2015 GJX show.

Tucson 2016

Tao Hsu and Andrew Lucas, April 28, 2016

An overview of the 2016 gem shows.

Purple pyrope-almandine garnets from Manica Province, Mozambique

Purple Pyrope-Almandine Garnet From Mozambique

Supharart Sangsawong, Victoria Raynaud, and Vincent Pardieu, November 7, 2016

Analysis of attractive purple garnets from a new deposit in central Mozambique.

Suite of eight faceted and one rough magnesio-axinites.

Magnesio-Axinite from Merelani, Tanzania

Duncan Pay, May 8, 2017

A rare find from a limited occurrence in Tanzania’s Merelani Hills, along with a “Merelani mint” garnet, is seen in Tucson.

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