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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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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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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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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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Hydrothermal Synthetic Red Beryl from the Institute of Crystallography, Moscow

Hydrothermal synthetic red beryl has been produced for jewellery applications.

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Separating Natural and Synthetic Rubies on the Basis of Trace-Element Chemistry

Natural and synthetic gem rubies can be separated on the basis of their trace-element chemistry.

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Synthetic Rubies by Douros: A New Challenge for Gemmologists

Greek manufacturer J. & A. Douros introduced a new flux synthetic ruby in early 1993.

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Abstracts; Summer 1991

From the Summer 1991 issue of Gems & Gemmology, a summary of important gemmology-related articles published in other journals.

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