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Turquoise-Rock Crystal Composite

Examination of a faceted rock crystal backed by a slice of turquoise—an obvious but unusual combination of gem materials.

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Determining Garnet Composition from Magnetic Susceptibility and Other Properties

Quantitative measurements of magnetic susceptibility combined with RI or SG data can provide an easy and inexpensive way of inferring garnet composition.

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Article
A Discussion on Ruby‐Glass Composites & Their Potential Impact on the Nomenclature in Use for Fracture‐Filled or Clarity Enhanced Stones in General

Describes several rubies treated with glass and experiments on rubies treated with glass, demonstrating that the stones are bonded together by the glass.

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Composite Amber with an Unusual Structure

This 9.12 gram amber composite featured a combination of natural and imitation amber, accompanied by natural and artificial insect inclusions.

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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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Some of the specimens used for this report. The rough specimens on the left represent the starting material, the specimens top and right represent the treated rough, and the specimens at center are cut from the treated rough.
Article
A Discussion of Ruby-Glass Composites

Describes several rubies treated with glass and experiments on rubies treated with glass, demonstrating that the stones are bonded together by the glass.

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String of beads
Attractive Composite Quartz Beads

Beads are identified as quartz with polymer.

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An Opal-Calcite Composite

Gem Testing lab in Jaipur, India recently examined a white-brown, translucent to opaque oval cabochon that turned out to be a composite featuring an unusual combination of gem materials.

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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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A New Type of Composite Turquoise

Several conspicuously colored specimens marketed as dyed and/or stabilized turquoise were recently examined.

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