Presidium Gem Indicator PGI Colored Gemstone Testers Gemological Testing Instrument Tools

Presidium Gem Tester (PGT) Functionality and Features

Gem Tester II: Quick Diamond/Moissanite Identification & Colored Gemstone Separation

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Presidium Gem Indicator - YQ-103

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Colored stones Tester

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Presidium Instruments Gem Indicator (PGI) Handheld Tester for Identifying Diamonds and Common Colored Gemstones : Arts, Crafts & Sewing