Rare pearls, along with their shell, are studied in the Hong Kong lab.

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

Gold: Vortex, Virtues, and Values was hosted by Initiatives in Art and Culture (IAC) at Bohemian National Hall in New York City, April 12–13. Now in its eighth year, the conference has become an annual industry gathering for those looking to evaluate the market, discover exceptional work, and discuss key gold-related issues.

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

A diamond examined in the Carlsbad lab shows chameleon coloring in an unusual pattern.

Irradiated CVD-grown diamonds are examined in the Carlsbad lab.

全5部の連載記事『カラー宝石（ダイヤモンド以外）の価値要因、デザイン、カットの品質』の第1部。この記事は、カラー宝石の価格に影響を与える主な価値要因について説明します。

Part 5 of 5 in the series “Value Factors, Design, and Cut Quality of Colored Gemstones (Non-Diamond)” explores craftsmanship’s bearing on cut quality.

Part 3 of 5 in the series: Value Factors, Design, and Cut Quality of Colored Gemstones (Non-Diamond). This article examines how cutting decisions can have a profound affect on a gemstone’s color quality.

A look at the mining and distinguishing characteristics of this naturally vibrant blue sapphire.

The first installment of G&G’s newest section explores how natural diamonds shed light on the mystery of water found in Earth’s deep mantle.

Examines Japanese “Kasumiga” freshwater cultured pearls, which grow in a variety of colors.