Update on Trace-Element Chemical Characteristics of Golden Sheen Sapphire
An update the gemmological and chemical characteristics of golden sheen sapphires from Kenya.
Gemstone Guidebook Project
A project coordinated by GIA and the NGO Pact provides a valuable educational tool to women miners in Tanzania.
Twelve-Rayed Star Sapphire from Thailand
A black star sapphire produced from eastern Thailand, showing both golden and silver rays, is studied at GIA’s Bangkok lab.
Sapphires from Northern Ethiopia
A new source of sapphires is found in the Tigray region of Ethiopia.
New Designs from Paula Crevoshay
World-renowned jewellery artist Paula Crevoshay displays some of her newest pieces at the Tucson gem shows.
Ethical and Sustainable Vertical Integration in the Sapphire Market
The recession of 2008 transforms a gem business into a vertically integrated operation.
Tourmaline and Sapphire from Nigeria
An update on Nigerian coloured stone production is obtained at the Tucson gem shows.
“Punsiri”-type FTIR Spectral Features in Natural Yellow Sapphires
Testing of natural-colour yellow sapphires from Australia and Thailand with the FTIR features of “Punsiri” heat-treated material.
Multiphase Fluid Inclusions in Blue Sapphires from the Ilmen Mountains, Southern Urals
Sapphires from Russia’s Ilmen State Reserve may provide an insight into gem-quality corundum from secondary placers.
Jewelry Television in Tucson
A look at JTV’s history, current activities and impact on the industry.