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PRESIDIUM OTI All in One Diamond Tester User Guide

June 20, 2024

PRESIDIUM OTI All in One Diamond Tester IMPORTANT INFORMATION OTi is intended to be used on polished colorless gemstones that are proportionately cut with a minimum table width of 1.6mm…

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Presidium Gem Tester II (PGT II) Instruction Manual

PGT-II • January 15, 2026

Comprehensive instruction manual for the Presidium Gem Tester II (PGT II) with Assisted Thermal Calibration (ATC), designed for identifying diamonds, moissanites, and common colored gemstones based on thermal…

Presidium Instruments Gem Indicator (PGI) Handheld Tester User Manual

PGI • October 31, 2025

Official user manual for the Presidium Instruments Gem Indicator (PGI) handheld tester, providing instructions for setup, operation, maintenance, and troubleshooting for identifying diamonds and colored gemstones.