An overview of some of the most fabulous and famous diamonds that Harry Winston has known.

Two major sources of error make spectroscopically determined color grades unreliable.

The authors examine an unusual crystal in matrix.

Advances in geophysical technology and computer imaging now permit mapping of geologic features at various depths beneath the Earth’s surface in more detail than ever before.

Gem-quality rubies and fancy-color sapphires have been recovered from dolomite marble lenses located high in the Himalayan mountains of east-central Nepal (Ganesh Himal).

During this period synthetics matured, with many new manufacturers and greater manufacturing capacity.

The 1980s witnessed great development in the application of new technologies to gemology.

This article, from the Spring 1994 issue of Gems & Gemology, is a compilation of abstracts of important gemology-related articles published outside of Gems & Gemology.

Some manufacturers are known to have treated Verneuil flame-fusion synthetic rubies by immersion in a flux melt to induce patterns like the “fingerprints” seen in some natural rubies.

The discovery of significant quantities of gem-quality sapphire in Minas Gerais could add corundum to the formidable list of gem species already commercially produced in Brazil.

Tairus, in Novosibirsk, has produced yet another new type of Russian hydrothermal synthetic emerald.

This document provides the publication information for Gems & Gemology

This document provides the publication information for Gems & Gemology

The gem and jewelry industry mourns the loss of one of its true leaders.

Hessonite thought to be glass-filled is found to have been treated with polymer.