What Should Be in the Ideal Gemmologist's Toolkit?
Instruments – GIA Store
GIA Gem Instruments Duplex II Refractometer. Dust cover - Aug 30, 2017 | Kodner Galleries Inc. in FL
Digital Gem Refractometer
GIA Instruments
Amazon.com: Presidium Instruments Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC) for Identifying Diamonds/Moissanites and Common Colored Gemstones : Industrial & Scientific