Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones

I love this tester and it's easy to use. I am well aware of how delicate the tester point is, so I am VERY careful with it and keep the tip cover on when not in use. This is a great item to have on hand. You can test all the gems you're unsure about... and do the same for your friends. It comes in a nice case and is easy to store. I had a tester for decades before this one, but it just tested diamonds. This one does so much more and the price is so reasonable. Treated right, you will have it for years and years. AND... it's so easy to use!

We are not new to gemstones. 25+ years experience. We usually test with refractometer, polariscope, spectroscope, etc. but this is portable and customer displayable. It came today and I tested 100 cut stones with 100% accuracy once I calibrated it and got a feel for pressure and 90* angle on the probe. It tested one of my prettiest cut garnets as glass! *^+}{^*! But I put that garnet under the refractometer and it is indeed glass. I hope I didn’t pay much for that rock. This machine tests thermal conductivity. Pretty reliable method to distinguish Glas from precious stone. But; a lot of specimen species have the same thermal conductivity. It’s really good for telling if that ruby ring is a ruby and not garnet or glass. It’s just a starting clue for identifying “what is this random gem?” It calibrates easily. The case isn’t protective enough, especially of the probe. Tools this low price won’t define lab vs natural - need a microscope and skills for that. Overall it’s a great buy at a reasonable price. You don’t become a Graduate Gemologist with one tool but it’s great for buyers, resellers, and collectors to confirm what you’ve got. Easy to use. Performs outstanding. A touch expensive for occasional use. Treat that probe gently, a new on will cost you. Read a book or two if you don’t know that amethyst and citrine are the same mineral species or that sapphire comes in colors. It doesn’t do opal or organics.

It is not as accurate as we hoped and the descriptions are not accurate if glass and all the items below it are the same reading and you have to have the batteries in it as well as being plugged in or it will not work. The point of batteries is so it can be used off site for testing items where there may not be electricity, but guess you can use a power pack. I sent pictures of the box before too, it had a small box with the items in it and then no packing to protect it, so it bounced around and had some damage, have not had long enough to know if work properly or not yet due to any damage that may of caused.

Try to be sure you come at the gem with the probe at a 90 degree angle as much as possible. On small tiny ones try not to let it slip to the side. This thing totally masters knowing what is glass and what is a real gem. Even where readings overlap, you can use possible colors to eliminate the other one or two. I love it. I refused to go pay some old white man $300 to hem and haw then finally used the same instrument. All I mostly need you know is ... is this glass or not? I got one bin for glass non precious and another bin labeled NOT GLASS. The not glass can be figured out when time comes. Get it. It sings YES ! on my old real diamonds. I see so much glass sometimes I just read my diamond 18k hoop earrings to see something real.

I reached out to Presidium shortly after purchasing this because it would not *read glass...needle didn't budge one bit after calibration. I was told by other purchasers that this isn't right. I was asked to send video and more explanation (which I did)...after sending their requested information (twice), I never heard from them again. I resolved to thinking that mine just read glass as nothing as it seemed to do okay with other stones. Then, one day I went to use it and it just quit working altogether. After warming up, the needle jumped to diamond and stuck there. It wouldn't make any effort to calibrate or anything. I changed batteries to see if that was the problem. Nope...still nothing. I reached out to the company again but so far have not heard a word back. For as expensive as this machine is....IT SHOULD LAST LONGER THAN 18 MONTHS. I will update this review if I ever get a response from them but as for now, I will not recommend this product at all.

I have been a professional Geologist for over 40 years and this takes the uncertainty out of most gemstones. I do not use the included cord as I don't use the tester it that much. The 2 x AA Alkaline Rayovac batteries last quite a while (not included). I am very impressed. The scale is a bit small for my aged eyes, but that is what reading glasses are for. I believe that the device is made in Turkey and the quality is good. Mine did not come correctly calibrated, but I would have re-calibrated anyway and it is very easy to do. Brief directions are included, or I downloaded the 18 page version from the company website for my alter ego, a professional engineer. It seemed a little pricey, albeit I purchased it anyway. As it works, that is what really counts. I ordered the SmartPro SPGE-I Gem Eye I Gem and Diamond Tester Smart Pro first, but it did not work and they were unable to send a working one after returning it, so I bought this one and had no problems.

This item is very easy to set up, use and calibrate. That being said, the readings for the individual gemstones overlap enough that it is not clear what gemstone you actually have. At this price point I would expect a bit more accuracy. At best what you are getting is a ‘best guess’ reading. It does a good job testing for diamond, but there are other testers out there for diamond testing that are much more affordable. Again, this gear is too expensive to be as ‘approximate’ as it is in the readings.

Worked as expected, very happy with the product.

Excellent for cataloging gems... it is not a professional way... but it is a quick way... and then it is advisable to do professional examinations

The Presidium was everything that I expected. Works well and the calibration instructions were easy to follow. I have only one suggestion for improvement and that is to value add by offering a US-to-Australia power plug adaptor.

لقد تم تجربة المنتج على احجار اللماس صحيحه ١٠٠٪؜ ولم يعطي نتيجه صحيحه كل ذلك اقل بنسبة ٣٠٪؜ وهاذي نسبة تخلي الواحد يتراجع او يفرط في قطعه ١٠٠٪؜ صحيحه والشي الاخر لم تتم اعادة المبلغ الى الان مايقارب ١٤ يوما واكثر ولا زلت انتظر وكل يوم اتصل ولا احد يفيدني

الجهاز جيد ويعمل دون أي مشاكل، لم استفد منه بشكل كامل لاني استخدمته لفحص الصخور والاحجار في صورتها الاساسيه وليس المجوهرات والمشغولات كما يفترض.

Muy buen producto funciona de maravilla