Testing instruments
A.KRÜSS Optronic GmbH
Hamburg maker of laboratory optical instruments whose gemmological range covers refractometers, microscopes, polariscopes and spectroscopes.
The record
Kind of equipmentTesting instruments
BasedHamburg, Germany
Founded1796
Price, as listedPrices are published in euros on the company's own gemmology shop, kruess-shop.de; the ER605 refractometer is listed from EUR 435.00 and a small mobile stainless steel stone laboratory from EUR 2,831.00.
StatusTrading
What it makes
Named as the maker names them on its own site. Specifications and availability change; confirm with the maker before ordering.
Gemstone refractometer ER601-LEDGemstone refractometer ER605Diamond and moissanite testing instrument DSP10Coloured stone estimator DSP20Diamond testing device DSP30Gemstone microscopesImmersion microscopesPolariscopesDichroscopesSpectroscopesUV analysis lampsGem Labs
Worth knowing
The gemmology range is sold through a separate company-run shop domain, kruess-shop.de, rather than the main corporate site. The company states a history dating to 1796 and serves laboratory and pharmaceutical markets alongside gemmology.
Compiled from kruess.com, read on August 16, 2026.
We record what makers publish about themselves. We have not tested this equipment, we take no commission on it, and a listing here is not a recommendation to buy.