High Accuracy Diamond Tester Professional Jeweler For Novice and Expert - Diamond Selector II 9V Battery Included

Product Information

This has both an anlogue meter operated by a probe ('thermal' tester) and a digital meter (for refractive index/reflectivity). There are pros and cons of both types. In summary, the digital meter will test 40 stones, but it will only test loose stones (not stones set in jewellery) and you have to be careful and clean to get a correct reading; the analogue meter is very easy to use (on loose stones and on set stones) but only tests 17 stones, most of which have overlapping readings: If a stone is really cold, it will feel cold-to-the-touch even if it's not diamond, and will register as DIAMOND on a diamond tester. This is a problem if a customer brings you a stone that has been outside on a very cold day, or if you are buying at outdoor fairs and markets in the winter. Take the stones into the warm then wait a few minutes for them to reach room temperature. This sophisticated and easy-to-operate desktop instrument combines advanced spectroscopic technology with GIA’s 60 years of diamond and gemstone identification research to distinguish natural diamonds from laboratory-grown (HPHT and CVD) diamonds and diamond simulants. of natural diamonds have an unusual composition ("Type IIa d iamond") and cannot be distinguished from synthetic diamonds. Yes, that is what is so good about this one, it can test any mounted stones (other models either don't test mounted stones at all, or are limited to small rings).

So if you are testing a large stone and there's a slight reaction with the lights, you know it cannot be diamond, even if the lights tip into the DIAMOND zone (test it again, turn the sensitivity right down).You notice that there isn't a reading not diamond ("simulant"); if you are not a diamond dealer or experienced jeweller you must be certain you are testing a stone that will register 'diamond' on most diamond testers; testing non-diamonds on a Synthetic Diamond Tester can give incorrect readings. Technical De Beers Institute of Diamondsnow offers a Set Diamond Service, a diamond jewellery testing service designed to ensure that all diamonds within your jewellery are natural.

Please note all prices listed are based on cash prices and are exclusive of VAT. Prices for precious metal products are an estimate only and can vary slightly depending upon the metal price, the actual weight and the cutting tolerances which we are able to achieve. Firstly, a very rare type of diamond (imaginatively named Type II). These are indistinguishable from other diamonds. It's merely a quirk of their chemical composition that they happen to be electrically conductive - which is why they register MOISSANITE on multi testers. These are rare, you might never come across one, but they do exist, they turn up regularly at gem laboratories, to settle disputes arising from the use of testers. Here is its full list of gemstones the Presidium handheld gem tester will detect (but please study the chart above, so see how the readings overlap!) -Gives correct results about 95% of the time (6% false positive rate, 4.5% false negative rate) providing the colour is 'clear' (colour D to J) and the size is at least 0.02ct and the cut isn't shallow. Easy to use, compact and sturdy, the Presidium diamond testers provide accurate and consistent results every time. Presidium Gauge My advice: if you want to test diamonds/Moissanite in a busy shop or at markets and fairs, get a Diamond/Moissanite ('multi') tester, they are very easy to use, especially if you are working under pressure. If you are working in an office where you can sit comfortably at a desk and work slowly and carefully, then get a reflectivity/Refractive Index gem tester as listed below. If you manage a group of stores (or an auction house) that does both - then get both. THERE ARE TWO TYPES OF ELECTRONIC GEM TESTER 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.