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Presidium Gem Testers, Diamond Testers
How to Calibrate Presidium Gem Tester II (PGT II) Tutorial
Australian Sapphire VS 0.43 Carat
Presidium Gem Tester II (PGT II) Testing Diamond, Sapphire, Ruby, Amethyst, and Calibrating
Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones : Presidium: Arts, Crafts & Sewing
How to identify Peridot gemstone.
Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones : Presidium: Arts, Crafts & Sewing
Presidium® Gem Tester II – ZAK JEWELRY TOOLS
Set of 5 Topaz From Brazil VS in 4 Mm 1.70 Carat
Let's Test Gemstones! Presidium Gem Tester II (PGT II) - Testing Emerald, Diamond, Sapphire, Garnet
ARI by Presidium Tutorial Video - Insert Probe Tip and Calibration
The Magic Wand of Truth and Lies [Gem Tester Tutorial]