Research Article Search Results

An expedition to Mogok, Myanmar, documenting the current state of their ruby mining, markets, and cutting industries. This exotic land, known as the "Valley of Rubies," is one of the world’s most famous gemstone sources.

An expedition to the Mogok area of Myanmar documenting the current state of their ruby mining, markets, and cutting industries. This exotic land, known as the "Valley of Rubies," is one of the world’s most famous gemstone sources.

Explores the emergence of the Luc Yen area as a producer of corundum, spinel, tourmaline, and other colored stones.

Examines the last two decades’ advances in analyzing and understanding the formation of natural diamonds, and their relation to the earth’s formation.

Reports on the microscopic, chemical, and spectroscopic features that differentiate the high-quality Baw Mar sapphire from “classic” gem-quality Burmese sapphire.

The centerpiece of this brooch is a 98.67 ct Melo pearl, believed to be one of the world's largest.

Many beautiful older diamonds are cut to different proportions than modern round brilliants, which makes them a challenge to grade according to modern cut conventions. This article describes how the GIA accommodates these historic gems.

Video compilation explores Brazil’s most important emerald deposits, as well as the country’s mining practices and laws.

An unusually large cultured pearl was filled with multiple cultured pearls, perhaps after the emergence of an original single-bead nucleus.

In October 2013, GIA’s Bangkok laboratory produced a study of the samples collected during the September 2012 expedition.