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Article

Is There a Difference Between Natural and Laboratory-Grown Diamonds?

Russell Shor, May 31, 2019

Learn about the differences – and similarities – between natural and laboratory-grown diamonds, and how GIA’s researchers and grading laboratories can tell the difference

Article

HPHT and CVD Diamond Growth Processes: Making Lab-Grown Diamonds

Dr James E. Shigley, July 25, 2016

While more people are becoming familiar with lab-grown diamonds, many still don’t know how they are actually made. Learn about the two diamond growth processes, HPHT and CVD.

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.

Irradiated Green-Blue CVD Synthetic Diamonds

Kyaw Soe Moe, Ulrika D’Haenens-Johansson, and Wuyi Wang, November 23, 2015

Advancing CVD growth technologies yield intensely coloured, high-quality synthetic diamonds, such as the two green-blue synthetic materials seen in the New York lab.

5.03 ct Fancy Deep Blue HPHT Synthetic Diamond

Largest Blue HPHT Synthetic Diamond

Kyaw Soe Moe, Paul Johnson, Ulrika D’Haenens-Johansson, and Wuyi Wang, April 28, 2016

Analysis of a 5.03 ct HPHT-grown blue synthetic diamond, the largest ever examined by GIA.

Analysis of Yellow Diamond Melee for Colour Treatment and Synthetics

Caitlin Dieck, Manisha Bhoir, and Paul Johnson, April 28, 2016

A parcel revealed to contain natural, treated and synthetic diamonds reinforces the importance of identification.

Six near-colorless HPHT synthetic melee diamonds

Near-Colourless Melee-Sized HPHT Synthetic Diamonds Identified in GIA Laboratory

Wasura Soonthorntantikul and Piradee Siritheerakul, July 31, 2015

The Bangkok lab examines near-colourless HPHT synthetic diamonds in melee sizes.

On the left is a 5.26 ct Fancy deep blue heart shape HPHT synthetic diamond. On the right is a 5.27 ct Fancy deep blue emerald cut HPHT synthetic diamonds.

Article

The Latest on Synthetic Diamonds

GIA, September 8, 2017

Dr James Shigley, GIA distinguished research fellow, is one of the foremost experts in diamonds and their identification. In this presentation recorded at the 2017 JCK Las Vegas show, he shares the latest developments about HPHT and CVD synthetic diamond

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

Article

Autumn 2015 G&G: Trapiche Emeralds, Synthetic Diamonds and a Large Diamond Source

Russell Shor, November 4, 2015

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

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