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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 specimen was revealed to be a synthetic star sapphire.
Unusual Combination of Inclusions in Synthetic Star Sapphire

A hexagonal boundary, usually found in natural material, is observed in a synthetic star sapphire.

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Chinese HPHT-grown synthetic diamonds
Large Colourless HPHT Synthetic Gem Diamonds from China

A report on the HPHT growth of large, gem-quality colourless synthetic diamonds in China.

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IMG-FA13-GNI 154371 300x169
Phosphorescence in Synthetic Sapphire

Rare phosphorescence was observed in a synthetic sapphire, which had unusual properties not indicative of a particular growth method.

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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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Verneuil-grown synthetic spinel with unusual short-wave UV reaction
Unusual Short-Wave UV Reaction in Synthetic Blue Spinel

A blue synthetic spinel grown by the Verneuil process displayed the short-wave UV reaction of a flux-grown sample.

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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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14 ornaments of coral veneer glued to matrix
Composite Coral Veneer Glued to Artificial Matrix

Items presented as red coral are revealed by testing to be composite coral veneers over an artificial matrix.

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