Presidium

Presidium: Specialist Gemstone Testing Instrumentation

Presidium is a world-renowned brand of gemstone authentication that makes electronic testers and gauges that are used by jewelers, gemologists, and appraisers from across the globe. Precise and consistent to their name, Presidium instruments make it simple to identify and measure diamonds, color stones, and synthetics.

Presidium Gauges and Testers for Gemstone Identification

Presidium offers a total selection of instruments to aid in a total range of testing needs.

• Presidium Gem Tester II is designed to identify diamonds and a wide variety of colored stones by thermal conductivity.
• Presidium Multi Tester III uses both electrical and thermal conductivity in identifying diamonds against moissanite.
• Presidium Gem Indicator gives quick identification with a handheld, digital pen-type instrument.
• Diamond-Mate A tester gives instant diamond identification in the field.
• Presidium Synthetic Diamond Screener II identifies CVD/HPHT synthetic diamonds using UV technology.
• Presidium ARI Diamond Tester confirms natural diamonds with high accuracy.

Gemstone Gauges and Measuring Equipment

Presidium gauges are ideal for professional gem measurement and estimate work.

• Digital Gemstone Gauge and PDG Dial Gauge allow precise stone size readings.
• Digital Gem Computer Gauge includes software integration to estimate carat weight from size.
• Presidium Carat Scale offers very accurate gem weight readings up to 100ct.

Advanced Laboratory Tools and Accessories

Presidium also provides specialized laboratory equipment and upgrade parts.

• Refractive Index Meter (PRIM II) is an optical non-destructive analysis solution for properties.
• Replacement probe pens and parts extend the life of your Presidium products.

Why Professionals Trust Presidium

• Gemmological laboratory, appraiser, and retail professional rely on Presidium.
• Portable and desktop versions for field or store testing.
• Digital results eliminate time waste and reduce subjectivity in grading.
• Simple-to-use controls and rugged construction provide long-term stability.

Where precision matters — from showroom to lab — Presidium provides peace of mind to every test.