How-To Guides

Last updated: August 2026

Step-by-step guides to gemstone identification — instrument technique, measurement, and testing protocols.

Instrument technique

Identification protocols

Related sections

Instrument Guides

Tools

The instruments used in property-based identification — refractometer, specific gravity, Chelsea filter, and UV fluorescence — with links to each technique guide.

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Look-Alike Separations

Comparisons

Side-by-side separations of commonly confused stones — ruby vs. spinel, diamond vs. moissanite, natural vs. synthetic, and more.

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