Research & News
Geographic Origin Determination of Paraíba Tourmaline
Copper-bearing gem tourmaline, known as Paraíba tourmaline after the location of its original discovery, is prized for its vivid blue to green color. This article explains GIA’s use of quantitative chemical analyses to distinguish samples from Brazil, Nigeria, and Mozambique.
The Real Gemology of Ethiopian Opals in ‘Uncut Gems’
Taking a look at the rough opal that plays a major role in the Adam Sandler film “Uncut Gems.” What is the real gemology and source information of opals?
Jewelry Sales Show Modest Rise; Higher End Soars
U.S. holiday jewelry sales increased slightly from 2018. Online buying surged, while foot traffic in retail stores slowed.
A rare faceted vlasovite is encountered for the first time at the Carlsbad laboratory.
The Rare Sun Diamond
An eye-visible cloud with a star-like pattern is highlighted by the cut of the Rare Sun diamond.
Coronavirus Impact; Diamond, Gold Report
The economic impact of the coronavirus in mainland China and Hong Kong. Plus, an update on the diamond market and gold jewelry.