Although the original Japanese version was the best, not all Chinese copies are 'bad'. All Diamond Selectors look the same on the outside but the quality of the components varies hugely. This affects the reliability, both in terms of giving correct readings and in terms of breaking down completely. If your tester works consistently (it gives the same reading on the same stone every time) and correctly (it accurately identifies stones) then you really don't need to know the principle on which it works. However, if you are having problems (and you have read the instructions and are certain you are using it correctly) - then a knowledge of the principle will help. if the number of lights equals or exceeds 9, and it beeps, it means the diamond is true. * if the lights is about 9 and it beeps, it means the sapphire is true. * if the number is 6.5-7, it means the agate is true. * if the number is 7-8 , it means the crystal is true. * if the number is 6-7, it means the jade is true. A cubic zirconia stone, for example, won’t even conduct the heat at all because it is warm. And a large sapphire, for example, may conduct some heat but not much. Reliability of a Diamond Selector The purpose of a Multi Tester is to show you if the stone is diamond or not diamond. It carries out the diamond test (see above) then, a fraction of a second later, it carries out the Moissanite test (see above) and its microchip combines both readings and calculates a response.

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Dual function: the diamond tester can test the authenticity of diamonds(above 9), and can also test the hardness of finished jade crystal agate with a hardness value between 5-9. A warm diamond won’t read correctly so some of the tests may be incorrect. Therefore, allow the diamond to cool if it gets warm before you run more tests. SensitivityDiamond Selector II Diamond Tester 2 Gemstone Selector II with LED Indicator Jewel Jewelery Gems Diamond Testing Tool Portable Culti Diamond Selector 2 Electronic Diamond Tester Genuine Real Diamond or Fake Diamond Indicator with Metal Stone Rest + Soft Carrying Case + 9 Volt Battery intuitive design]: fake crystal, such as cubic zirconium ( cz ), crystal, glass will be no sounds and lights <9.

143-280 Diamond Selector II - AF Switzerland

And it is important I let you know that if you keep running tests on that same diamond, it would become warm. Very small stones heat up easily, large stone tend to stay cool, but we do get a spate of complaints during a heat wave when the temperature gets into the thirties.Do not test the same stone repeatedly, until it becomes hot. A hot stones will not register 'diamond', even if it is. Inconsistent readings miraculously become consistent if you wait a minute or two for the stone to cool down.