Presidium PGI Handheld Gem Indicator — Diamond & Coloured Gem Tester, USB Rechargeable, LED Readout

The Presidium PGI Handheld Gem Indicator is a portable tester that distinguishes diamonds from many coloured gemstones and delivers clear results in seconds.

The PGI combines a retractable thermoelectric probe, colour input function, and a digital LED readout to give jewellers, appraisers, and hobbyists rapid, reliable identification across an extended list of 31 gemstones. Lightweight and ergonomic, the unit runs on USB power or internal battery and is built for bench and field use where quick decisions matter.

How fast and accurate are the PGI test results?

Results appear on the LED screen in under six seconds for most stones, enabling swift sorting and preliminary identification without removing the setting in many cases. The retractable thin probe maintains consistent contact pressure, reducing user-induced variation and improving repeatability.

• Typical readout time: <6 seconds for most gems
• Probe maintains steady pressure for consistent measurements
• Digital LED display shows clear, immediate identification

Which gemstones does the PGI differentiate and how does the colour input help?

The PGI is calibrated to test 31 common gemstones, including diamonds and frequently encountered coloured stones. The colour input option narrows down ambiguous responses by factoring visible colour, which increases the precision of the suggested identification.

• Supports identification across 31 gemstone types
• Colour input reduces misidentification among visually similar stones
• Useful for separating treated or similar-composition gems during screening

What design features make the PGI practical for daily use?

Built with an ergonomic chrome-brushed grip and a slim retractable probe tip, the PGI is comfortable to hold for extended sessions and able to reach small or tight settings. The USB port allows flexible power options, and the compact handheld form fits easily in a tool kit or bench drawer.

• Ergonomic grip reduces hand fatigue
• Retractable thin probe for precise contact on small facets
• USB port for alternative power sources and easy recharging

Can I rely on the PGI for professional workflows?

While not a replacement for exhaustive laboratory analysis, the PGI is an industry-trusted field tester that speeds up routine screening and triage. Many professionals use it as an initial filtering tool before sending samples for advanced gemological testing.

• Ideal as a rapid screening device in professional settings
• Helps prioritize stones for laboratory analysis
• Durable design for daily bench and on-site use

Who is this for: The Presidium PGI is aimed at jewellery retailers, gemologists, pawn and estate buyers, repair technicians, and serious hobbyists who need a quick, portable method to distinguish diamonds from common coloured gemstones. It’s best used as a fast, reliable first step in identification, complementing more detailed laboratory methods when certainty is required.