works on any stone, you are not limited to jewellery that will fit over the sensor, you are not limited to transparent stones with a flat top (table), they even work on 'rough' (uncut) stones.

We have 11 locations and have been in business for 35 years. This Gemlogis business diamond tester is hands-down the best diamond tester we have ever used. It is unmatched in its ability to reliably identify CZ’s, moissanite, and lab grown diamonds. All 'simple' diamond testers will register the manmade stone Moissanite as being diamond. "Diamond/Moissanite" diamond testers (also called 'Multi' diamond testers) will distinguish the two. The most popular model is the Multi Experior, and it will also indicate ruby/sapphire (but no other gemstone). Relatively cold" stones give a high (and for large diamonds, lightning-fast) reaction on the LED segments.

THERE ARE TWO TYPES OF ELECTRONIC GEM TESTER

Diamond testers that measure only the thermal conductivity of a stone cannot tell a real diamond from moissanite as these two stones are very similar when it comes to interaction with heat. To get accurate results, you will need a tester that measures the electrical conductivity of a stone or combines both aspects because diamonds and moissanites conduct electricity differently.

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 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. The test-tip (probe) on the tester must be clean, especially if it hasn't been used for some time. Clean it by rubbing it (at right angles) on in a circular motion on an ordinary piece of paper. This is stated in the instruction manuals of most models, along with a diagram. On a diamond-only tester, the tester will become less sensitive if the tip is dirty, i.e. you'll have to turn the LED Lights (sensitivity) up higher than usual. With a multi-tester, both diamonds and Moissanite will sometimes read, "Other stone", though not necessarily on every test, which will give the impression the tester is 'not consistent' or 'erratic' or "not reading diamond on known diamonds". Cleaning the tip fixes these problems. Diamond testers’ principle of operation is based on the fact that each type of gemstone has its chemical structure, meaning each of them conducts heat and electricity differently. In other words, heat or electricity will pass through an authentic diamond in a different way than it would through cubic zirconia, for example.Our laboratories are in three global locations: Antwerp, Surat, and Maidenhead. At allour facilities, our experts use comprehensive analysis using a variety of different in-house and proprietary equipment to ensure that every diamond we assess is natural. You can see from the picture which stones it will test, also note how the readings overlap. It is for this reason that I say the tester is best for showing what a stone is NOT rather than what it is, e.g. a customer is offering you a sapphire, you can see that it might be glass, it might be garnet...but it can't possibly be sapphire. Despite its limitations, it is still useful for pulling out gemstones worthy of further investigation, e.g. you may be interested in stones that might be ruby/sapphire and not at all interested in anything that is probably glass. It is also particularly easy and fast to use and can be used on any stone no matter how it might be mounted.