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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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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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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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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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Irradiated CVD synthetic diamonds.
Three Irradiated CVD Synthetic Diamonds

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

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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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Clear, blue and pink synthetic diamond jewelry is displayed around and on pink boxes.
Article
De Beers’ Synthetic Shock Draws Mixed Reactions at 2018 JCK

Retailers had mixed reactions to De Beers’ announcement that it would offer a low-priced line of synthetic diamond jewellery, called Lightbox.

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Micro-Features of Ruby
Inclusions in Natural, Synthetic and Treated Ruby

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

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Drilled natural pearls examined in this study.
Saltwater Pearls from the Pre- to Early Columbian Era: A Gemmological and Radiocarbon Dating Study

Examines 85 saltwater natural pearls, reportedly harvested from the Caribbean islands off the coast of Venezuela during the early 16th century, to determine their age.

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