Gem Testers

Testers for gemstones, electronic (latest) and optical (as used by gemmologists).

Electronic Gem Testers

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Two types, thermal conductivity or reflectivity - article.

Optical Gem Testers

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Standard long-established testers used by gemmologists. - article.

Mechanical gem testers, gem torches

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Hardness test. Specific gravity (relative density) test - article.

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