Review on 💎 Black Diamond Tester II V2 Selector Tool for Gemstone Jewelry Gems with Case - StillCool Diamond Testers by Nicole Mcleod

I received it a few days ago and did some testing. I have a few (quite a few) vintage rings, mostly with gemstones, that I wanted to look at. To be honest, I wanted to understand where the garnets are and where the rubies are. Turned it on and waited for it to heat up, looked at the back to see what the calibration rates were and calculated from C to F. It's a lot easier to test jewelry with a tester while you have it in your hand hold, and don't forget Keep your finger on the metal pad behind it. I found testing with diamonds was fastest, the bars just bounced off the tool; Testing the other stones took a little longer as there was sometimes a pause before the extra bar appeared. I have tested grit and various sizes from 0.05 cents to 0.25 cents in the old European cut, all tested as diamonds. I have a piece of paste on the pin which I also checked, no movement. Another thing I noticed was that it didn't matter if I resized for a larger stone (2 bars) when I tested the diamonds they still flew up. However, this is important when testing non-diamond gems. After that I moved on to sapphires, I have blue and white synthetics, a pair of star sapphires, natural white and blue 1 carat. all tested with 4 bars added for calibration (not sure what would happen if I had a really small bar and started with 8 bars). I also checked the stone I thought was glass I had on a great looking 10k ring. This stone was really dull and ugly and about 1/3c. calibrated the instrument to 4 bars and to my surprise it went up 4 bars. After dipping the ring in a glass of warm soapy water and then brushing it with a toothbrush I was amazed to see how sparkling it was, not fire but certainly a beautiful stone comparable to my natural white sapphire. small stones I have and found that it was almost easier to check them by holding them in my hands rather than using a stone holder. As for the rest of what I've found: When testing Rubies +4, Sapphires +4, Amethyst +2, Emeralds and Garnets +1 (Members of the Beryl family have a very wide range of electrical conductivity, so your results may vary depending on your origin ) Opal +0 {Onyx, Tiger Eye, Agate, Bloodstone, Carnelian, Moonstone} +1, Hematite +2. Also found a stone or two that I still can't identify but definitely narrowed down what they might be, discovered that the purple stones in the turn of the century carved gypsy mount were pyrope garnets, not amethysts, I thought, realizing that two of the bottom rings that I thought were glass/paste actually had gems at the bottom of the range. The same +4 for mined rubies in my Edwardian jewelry as for a synthetic ruby in a 1950's ring. Overall I really like it, although it can be a bit unwieldy at times. The lid fits well and protects the handpiece and body. Just keep track of where the bands are after each test, as sometimes you may need to adjust them a bit. I usually tested non-diamond gems a few times due to slower bar times. I will keep updating for durability.