Protect yourself. Protect your business.
Screen every diamond.
GemPen® is a powerful portable tool for jewellers & gemmologists to screen diamonds, rubies & sapphires for synthetics & treatments.
Diamond Verification Instrument

Xenon UV screening tool with Ultra Spectrum Optical Filtering Technology

Distinctive indications

Separate natural untreated from synthetic and treated stones

Throughout the value chain

Works for rough, polished and mounted stones


A portable viewing environment for GemPen®

GemPen Academy / Gemstone Map

Knowledge resource hub for interpreting results

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GemPen® Premium & Darkroom - Screening Synthetic Ruby


GemPen® Premium & Darkroom – Screening Synthetic Ruby

GemPen® Diamond Screener & Darkroom Tutorial - Natural or Lab Created?


Watch GemPen® screen diamonds for synthetics

Tailored Accessories

Three additional interchangeable Filters

Tailored Accessories

Travel Case with perfect fit and feel

Awarded design

Awarded with a Red Dot for user-centered design excellence

Third party validation

GemPen® is included in the Assure Program for diamond verification instruments


Bring it anywhere. Battery powered and USB rechargeable

Time saving

Screen hundreds of stones in a matter of minutes

Size independent

Screen stones regardless of size


Dust, moist and shock resistant