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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.

An oval shaped bicolor tanzanite has purple on each side with blue-green in the middle.

Article

December Blues: Birthstone Gifts that Will Delight

Sharon Bohannon, December 7, 2018

Looking for a gift for someone special? December’s birthstones offer a treat for every taste, style and personality – even if it’s not their birth month.

Article

Fall for Autumn Gems

Sharon Bohannon, September 21, 2018

Nature gives us a brilliant palette of colour-changing leaves and a spectacular kaleidoscope of colourful sunsets during the autumn season.

Bursts of yellow and purple radiate throughout this round-cut ametrine.

Article

Colourblocking: The Art and Fashion of Multicoloured Gemstones

Sharon Bohannon, July 20, 2018

The fashion trend of colourblocking can be found in the artistic combinations of colour in multicoloured gemstones known for their colour zoning or banding.

Figure 1. One of GIA’s new LA-ICP-MS corundum calibration standards sets (set number 1); the epoxy disk containing the set is 1.5 inches in diameter. NIST SRM 610 and 612 glass standards are included to account for trace and non-trace elements, such as those found in inclusions, that were not incorporated into the synthetic sapphire crystals grown for standards. Photo by Jennifer Stone-Sundberg.

Accurate Reporting of Key Trace Elements in Ruby and Sapphire Using Matrix-Matched Standards

Jennifer Stone-Sundberg, Timothy Thomas, Ziyin Sun, Yunbin Guan, Zachary Cole, Randy Equall, and John L. Emmett, January 26, 2018

Presents a group of corundum standards developed by GIA to improve the accuracy and efficiency of its laser ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) instruments.

A round, bright red gem displayed on a dark gray background.

Article

The Red Hot Gems of Summer

Sharon Bohannon, August 21, 2017

These red, pink and orange hued gems evoke passion and excitement – and are sure-fire accessories for sultry summer days.

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.

Article

Spring 2015 G&G Examines Blue Spinel, Chinese Jewellery Design and the Latest in Synthetics

Russell Shor, June 12, 2015

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

Confusing, Triangular Inclusions in an Art Deco-Style Pin

Spring 1991 G&G Lab Notes

, March 1, 1991

This section, from the Spring 1991 issue of Gems & Gemmology, is a compilation of interesting finds from GIA’s laboratories.

Ruby in Diamond

Henry O. A. Meyer and Edward Gübelin, September 1, 1981

The first substantiated identification of corundum (var. ruby) occurring as an inclusion in natural diamond is presented.

Article Search Results

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Gemstones

Article Search Results

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Gemstones

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