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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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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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Article
Summer 2015 G&G: Dual-Stars, Photomicrography Guide, Rubies from Tajikistan, New Micro-World Section

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

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Synthetic Ruby Overgrowth on Natural Corundum
Article
Analysis of Synthetic Ruby Overgrowth on Corundum

Analysis of synthetic ruby overgrowth on corundum, using analysis of inclusions, UV-Vis-NIR and EDXRF spectroscopy, and LA-ICP-MS.

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Composite ruby rough
Unusual Composite Ruby Rough

In this composite, synthetic ruby rough attached to two natural ruby slabs was fashioned to imitate natural material.

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73.69 mm long Synthetic Ruby Crystal
Flame-Fusion Synthetic Ruby Boule with Flux Synthetic Ruby Overgrowth

This synthetic ruby specimen features two growth methods within the same crystal.

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Article
Insights From Inclusions

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

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Synthetic ruby in matrix
Assemblage of Synthetic Ruby in Calcite Matrix

Material set in a calcite matrix and represented as natural ruby is proven to be synthetic.

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Zig-zag growth in synthetic ruby
Flux-Grown Synthetic Ruby with Hydrothermal Synthetic Seed Crystal

An unusual synthetic ruby, combining a hydrothermal ruby seed and flux ruby overgrowth, is examined at the Carlsbad lab.

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