Testing (diamonds & gemstones)

Just a tiny insight into the world of optics, and how to test gemstones using standard (optical) gemmological instruments. CLICK "MORE" TO READ THE ARTICLE

Electronic gem testers, how they work, what they test, and which are the best. CLICK "MORE" TO READ THE ARTICLE

When buyiing a new pen (probe) for a Presidium gem tester, the tester must be recalibrated. CLICK "MORE" TO READ THE ARTICLE

Diamond Selector II by Culti, and copies made in China - how to tell the difference. CLICK "MORE" TO READ THE ARTICLE

BUY NOW: CLICK ON THE PICTUREMost DIAMOND SELECTOR are fake - details. Instruction manuals for diamond testers, combination testers, multi testers...

Solve 99% of problems concerning diamond testers, Moissanite testers and multi testers...all makes. CLICK "MORE" TO READ THE ARTICLE

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

How to test for diamond and how to avoid scams; beware of Moissanite; recommendations. CLICK "MORE" TO READ THE ARTICLE

  BUY NOW: CLICK ON THE PICTURE CONTENTS [TOC] INTRODUCTION Some gemstones appear to change colour when viewed through the Chelsea Colour Filter. ...

  SYNTHETIC DIAMOND SCREENER (SDSII) by Presdium SYNTHETIC DIAMOND + MOISSANITE TESTER (Veritas) by Gemtrue SDSII by Presidiu...

CLICK "MORE" TO READ THE ARTICLES LISTED BELOW These are information pages only. To buy diamond testers, click here. To buy gem testers click here.

An overview of methods of testing precious metals, as recommended by Quicktest.