Amazon.com: Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones : Industrial & Scientific
GIA Instruments
Gem Refractometer
GIA Gem Instruments Duplex II Refractometer. Dust cover - Aug 30, 2017 | Kodner Galleries Inc. in FL
Gem Instruments & GEMMODUL
Amazon.com: Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones : Industrial & Scientific
GIA GEM INSTRUMENTS SPECIFIC GRAVITY LIQUIDS SET | eBay
Dust Cover for GIA Illuminator Polariscope – GIA Store