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Jade
Article
Jade Description

Modern gemmologists use the word “jade” as a generic term for both nephrite and jadeite. These minerals have been linked throughout history.

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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

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

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A large group of people outside on GIA’s Carlsbad, California  campus.
Article
Guardians of Trust: GIA’s Innovative Research, Instruments and Services

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

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CVD, HPHT and Natural Diamonds
Article
Is There a Difference Between Natural and Laboratory-Grown Diamonds?

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

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Article
Identifying Lab-Grown Diamonds

Dr James E. Shigley describes the means of distinguishing colourless and coloured synthetic gem-quality diamonds from natural diamonds.

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LCM reveals traces of catalyst and step-like growth marks.
Observation of Etched Surface Micro-Features on HPHT Synthetic Diamonds Using Laser Confocal Microscopy

Laser confocal microscopy, a very reliable method of revealing surface micro-features, is used on an HPHT synthetic diamond to reveal growth structures.

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Irradiated CVD synthetic diamonds.
Three Irradiated CVD Synthetic Diamonds

Irradiated CVD-grown diamonds are examined in the Carlsbad lab.

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Within a parcel of 1,102 diamond melee, 1,092 were identified as HPHT synthetics.
One Natural Melee Diamond Found in Large Batch of HPHT Synthetic Melee

A single natural diamond is found within the largest percentage of undisclosed synthetic melee submitted to GIA.

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This 15.32 ct cushion modified brilliant is the largest HPHT synthetic diamond graded by GIA.
15 Carat HPHT Synthetic Diamond

A synthetic diamond seen in the Carlsbad lab is the largest faceted lab-grown diamond examined by GIA.

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CVD- and HPHT-grown synthetic diamonds.
Features of Synthetic Diamonds

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

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