Article Search Results

A large group of people outside on GIA’s Carlsbad, California campus.

Article

Guardians of Trust: GIA’s Innovative Research, Instruments and Services

Russell Shor, September 20, 2019

GIA’s services and instruments have grown in importance and impact as new gem treatments and laboratory-grown gems have entered the market.

A face-up view of a cushion cut diamond with blue color.

Article

Gems & Gemology’s 7 Most Unusual Encounters from 2019

Stuart Overlin, Brooke Goedert and Kellie Giordano, December 13, 2019

Check out some of the most interesting and unusual diamonds and coloured stones submitted to GIA’s laboratories in 2019.

Inclusions in Natural, Synthetic and Treated Ruby

Nathan D. Renfro, John I. Koivula, Jonathan Muyal, Shane F. McClure, Kevin Schumacher, and James E. Shigley, January 26, 2018

Provides a visual guide to the internal features of natural, synthetic and treated rubies.

Synthetic Ruby Overgrowth on Natural Corundum

Article

Analysis of Synthetic Ruby Overgrowth on Corundum

Sudarat Saeseaw, Vincent Pardieu, Vararut Weeramonkhonlert, Supharat Sangsawong and Jonathan Muyal, June 25, 2015

Analysis of synthetic ruby overgrowth on corundum, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.

Article

Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

Russell Shor, August 14, 2015

G&G Brief presents an overview of the content of the Summer 2015 issue of Gems & Gemology.

Abstract Header from the 2009 issue of Gems & Gemology

Abstracts; Summer 2009

Brendan M. Laurs, Thomas W. Overton

This article, from the Summer 2009 issue of Gems & Gemmology, is a compilation of abstracts of important gemmology-related articles published outside of Gems & Gemmology.

Flux-Induced Fingerprint Patterns in Synthetic Ruby: An Update

K. Schmetzer and F.J. Schupp, March 1, 1994

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 Ramaura Synthetic Ruby

Robert E. Kane, September 1, 1983

A report on the new synthetic ruby trade-named Ramaura.

Induced Fingerprints

John I. Koivula, December 1, 1983

This article reports the results of a series of experiments conducted to explain the phenomenon of induced fingerprints.

Some Diagnostic Features of Russian Hydrothermal Synthetic Rubies and Sapphires

Karl Schmetzer and Adolf Peretti, March 1, 1999

Most Russian hydrothermal synthetic rubies and pink, orange, green, blue and violet sapphires—coloured by chromium and/or nickel—reveal diagnostic zigzag or mosaic-like growth structures associated with colour zoning.

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