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

Product Information

Additional gems besides diamonds have high conductivity (such as moissanite) but a diamond tester can separate a diamond from a cubic zirconia. The latest diamond testing devices combine heat and electricity testing so they’re the most accurate. NO REACTION, if it's low thermal thermal conductivity (those that never give a reading on a standard diamond tester) - it could be anything, but it's not diamond A diamond tester is a staple household tool every industry user needs. While diamond testers were first available around 20 years ago, technological advancements and constant enhancements make today's diamond testing machines more reliable and accurate.

Moissanite is not diamond (neither natural diamond nor synthetic diamond) but it is useful to be able to detect these because they show up as diamond on cheap diamond testers. 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. However, it is worth mentioning that a diamond tester will not help identify if a diamond is created or natural. Other methods are used to distinguish between them. These methods include detecting colour zoning, strain patterns, inclusions, fluorescence, etc. Gemlogis are the proud owners of several patented diamond testers for sale, and continues to come up with breakthrough features in handheld and desktop diamond testing machines.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!) - nearly as easy as the 'Standard' Presidium, above - it has more settings, you can narrow the results by selecting the colour of the stone you are testing You will not get correct readings if, in that first split second, you remove-and-replace the probe or slide it across the stone or press hard then let go then press hard. It only works if you put the probe on the stone (in the centre of the stone) firmly - once. As with all of these testers, this is no problem if you can see what you are doing and you have a steady hand. If you can't see, please find your reading glasses or a magnifier. If you don't have a steady hand you will not be able to use a tester. There’s plenty of diamond jewelry online these days, and you want to ensure that the diamond you buy is authentic and has the quality you wanted (and bought). It’s important to keep a few points in mind when you’re browsing loose diamonds or diamond jewelry online:

NOTE: in the jewellery trade, "Diamonds" and "Gemstones" are regarded as separate industries. Diamond testers ( see separate article) are more precise since they are fine-tuned for testing diamonds only. 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 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 TESTERThis 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. From this principle you can now see that if you 'break the circuit', the tester will not register 'Moissanite'. You can also see that many items are electrically conductive, not just Moissanite, for instance, your body, and many household objects, even your fridge or a moist finger. 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. BUT - it's purpose is to tell you if you have a diamond or not, not to tell you if you have a sapphire/ruby, Moissanite, paste etc.

The Presidium diamond testers are designed to help you to distinguish the difference between diamonds and other stones. The Presidium Multi Tester and Diamond Mate Tester measure the thermal and electrical properties of loose and mounted diamonds, Moissanite and other colourless stones – including spinel, cubic zirconia and zircon – whereas the Presidium Gem Indicator has the ability to identify up to 31 different coloured stones. 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). you know, from your experience, that a customer is offering you paste, he says it's white sapphire, you need to show him the result on a machine, because customers believe machines rather than expert humans. The purpose of the Ari is to show the difference between synthetic (man-made in a laboratory) and natural (dug from the ground) diamonds, please read the product description.It depends on your diamond tester model. Some diamond testers make a sound to indicate that the test is over, while some will only show the readings on the meter. Choose a diamond tester that signals if you accidentally touch part of the metal setting instead of the stone. A common error is testing the metal instead of the stone and getting a false negative. If your tester doesn’t recognize metal, it can indicate that you are holding a real diamond when you unknowingly touch the setting, even if the diamond itself is fake. If a stone is very hot, it will feel warm-to-the-touch even if it is diamond, and will not register DIAMOND on a diamond tester. This happens when a diamond is taken from a shop window where hot lights or sunshine has heated it. It can be a problem in a heat wave, as the temperature approaches 30 degrees. Generally, high temperatures are not a problem here in the UK / Northern Europe. Get a friend or colleague to use the tester. Get two or three friends or colleagues to use the tester. As each one does this, either leave the room or keep your mouth firmly shut, don't give them any clues, let them work it out for themselves. Very often if it works when they use it, see what it is that they are doing different. Whenever anyone asks if a tester is "100% guaranteed to identify all diamonds" I take a deep breath. There are always always always exceptions. And these apply to all brands of diamond / Moissanite / multi testers.

Our products help you buy, value and sell at auctions and fairs, in the shop, or trading online. We are experts in chemical and electronic test equipment and supply most pawnbrokers, precious metal traders and jewellers in the UK. Make sure you opt for a device that uses electrical conductivity (heat + electricity): This type of model will help you test diamonds as well as moissanite. 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. Would this work with rough stones? I mean rough diamonds ? And show the difference between man made and natural?To get into greater detail, every gemstone has a unique chemical structure, so each one conducts heat and electricity differently. As a result, heat or electricity passes through an authentic diamond differently than a cubic zirconia. Are Diamond Testers Accurate? battery-operated plus USB port for alternative power source and (if required) to connect it to a computer Thermal testers work on heat. Their advantage is simplicity, touch the probe on the stone, see the reading, no skill and no special training is required. Disadvantages: they only work at room temperature (typically between 19 and 26 degrees C); they only test for a few stones and (as you see from the picture below) many of the readings overlap.