Introducing Darkroom
A portable viewing environment

A new tool for screening gemstones
GemPen is portable, time saving and versatile.

Get to know GemPen


UV screening tool designed for gemmologists

Tailored Accessories

Three additional interchangeable Filters

Tailored Accessories

Travel Case / Darkroom with perfect fit and feel

GemPen Academy / Gemstone map

Reference images for more accurate interpretations


Watch GemPen screen diamonds for synthetics

Awarded design

Awarded with a Red Dot for user-centered design excellence

Third party validation

GemPen is included in the Assure Program for verification instruments

GemPen stand out in particular by the following features:

Distinctive indications

Separate natural untreated from synthetic and treated gems


Bring it anywhere. Battery powered and rechargeable

Throughout the value chain

Works for rough, polished and mounted gems

Time saving

Screen hundreds of gems in a matter of minutes

Size independent

Screen gems regardless of size


Dust, moist and shock resistant