Article Search Results

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.

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.

Features of Synthetic Diamonds

Sally Eaton-Magaña and Christopher M. Breeding, August 6, 2018

Presents a visual guide to the growth processes and major gemmological spectroscopic features of synthetic diamonds.

Article

An In-Depth Gemmological Study of Blue Sapphires from the Baw Mar Mine (Mogok, Myanmar)

Wasura Soonthorntantikul, Wim Vertriest, Victoria Liliane Raynaud-Flattot, Supharart Sangsawong, Ungkhana Atikarnsakul, Charuwan Khowpong, Vararut Weeramonkhonlert and Vincent Pardieu, February 24, 2017

GIA field gemmologists visited the Baw Mar operations in 2013, 2014 and 2015. In this study, we analysed samples collected during two separate expeditions.

Article

Sapphires from the Gem Rush Bemainty area, Ambatondrazaka (Madagascar)

Vincent Pardieu, Wim Vertriest, Vararut Weeramonkhonlert, Victoria Raynaud, Ungkhana Atikarnsakul and Rosey Perkins, February 24, 2017

The discovery of many fine quality sapphires in this area is opening a new chapter in the conflict between conservation and gem mining in north-eastern Madagascar.

Synthetic Sapphire and Synthetic Spinel Doublets

Najmeh Anjomani, January 27, 2017

Unusual doublets created from two different synthetics are revealed at the Carlsbad laboratory.

Article

Autumn 2016 G&G: CVD Synthetic Diamonds Survey, Reversible Colour Change in Blue Zircon

Jennifer-Lynn Archuleta, October 31, 2016

A summary of the content found in the Autumn 2016 issue of Gems & Gemology.

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.

This specimen was revealed to be a synthetic star sapphire.

Unusual Combination of Inclusions in Synthetic Star Sapphire

Pragati Verma, July 31, 2015

A hexagonal boundary, usually found in natural material, is observed in a synthetic star sapphire.

Article

Insights From Inclusions

GIA, September 29, 2014

Natural gemstones are typically far more valuable than synthetic ones, so being able to identify them correctly is a powerful skill.

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Article Search Results

Types

Content Type

Reviewed

Topics

Topics

Gemstones

Find a Retailer

Visit the campus shop

Subscribe to Knowledge Rocks Emails

G&G Spring 2021 Edition