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Testing diamonds and gemstones:

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These are information pages only. To buy diamond testers, click here. To buy gem testers click here.
The complete guide to testing diamonds

The complete guide to testing diamonds

How to test for diamond and how to avoid scams; beware of Moissanite; recommendations.

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Diamond Selector diamond testers

Diamond Selector diamond testers

Diamond Selector II by Culti, and copies made in China - how to tell the difference.

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Distinguishing diamond from Moissanite

Distinguishing diamond from Moissanite

How to distinguish diamond from Moissanite (because Moissanite shows up as 'Diamond' on diamond testers).

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A lot about electronic gem testers

A lot about electronic gem testers

Electronic gem testers, how they work, what they test, and which are the best.

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Calibrating Presidium gem testers

Calibrating Presidium gem testers

When buyiing a new pen (probe) for a Presidium gem tester, the tester must be recalibrated.

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Diamond tester trouble shooting

Diamond tester trouble shooting

Solve 99% of problems concerning diamond testers, Moissanite testers and multi testers...all makes.

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A little about optical gem testers

A little about optical gem testers

Just a tiny insight into the world of optics, and how to test gemstones using standard (optical) gemmological instruments.

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Testing gemstones, the Specific Gravity (relative density) method

Testing gemstones, the Specific Gravity (relative density) method

An overview of methods of testing precious metals, as recommended by QUICKTEST

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Video for Multi-II diamond / Moissanite tester

Video for Multi-II diamond / Moissanite tester

VIDEO: See the Multi tester in use. This particular model is long-since discontinued, but the method of use is identical for later models.

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