Testing (diamonds & gemstones)

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• A lot about electronic gem testers

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

• Distinguishing diamond from Moissanite

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  How to distinguish diamond from Moissanite.

• Guide to buying diamond testers

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  How to test for diamond and how to avoid scams; Moissanite, diamond, and synthetic (lab-created) diamonds.

• Testing for synthetic diamonds

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  Synthetic-diamond testers are used by professional jewellers and diamond dealers who know that they have a diamond and want to know the chances of it being synthetic or natural. This article explains how they work.

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• A little about optical gem testers

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

• Calibration procedure for the Presidium Gem Tester II (PGT II)

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  Calibration instructions for Presidium Gem Tester II (PGT II).

• Diamond tester trouble shooting

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

• Instructions for the Chelsea Filter

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  Chelsea filter instructions

• Testing gemstones using the Specific Gravity (relative density) method

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  Test loose (not mounted) gemstones using nothing more than a weighing machine, an SG attachment, and water.