Headquarters based in Luleå, Sweden
We are in northern Sweden, near the Arctic Circle


GemPen® is a powerful portable tool for jewellers & gemmologists to screen diamonds, rubies & sapphires for synthetics & treatments.

About Us

Gemometrics AB is based in Luleå, which is the Northern Swedish high-tech and innovation hub.  We are the creators of GemPen® Diamond Screener, GemPen® Premium and GemPen® Darkroom.

The founder of Gemometrics AB is gemmologist and geologist Torbjörn Lindwall (FGA, DGA, MSc), who for more than 20 years has worked with identifying and valuing gems and jewellery for Companies, Authorities and Private clients all over the world. Torbjörn is also Research Advisor at Luleå University of Technology and Tutor at London based Gem-A (Gemmological Association of Great Britain).

The initial idea for GemPen® was developed by Torbjörn Lindwall due to the increasing insecurity in validating gemstones. The financial risk that buyers of gemstones are faced with is significant and affects the whole market behaviour. We offer a powerful portable gemmological instrument to help professional users evaluate gems for their true value and to assure the safe trade of gems throughout the whole supply-chain from mine to end-client!