www.kruess.com  -  Wednesday, September 8, 2010
Printer-friendly version of the page "Gemstone refractometers"  
(URL: http://www.kruess.com/edelsteinrefraktometer.html)

Gemstone refractometers are used for the classification and quality control of gemstones. The gemstone to be examined is simply placed on the prism with a drop of contact fluid. The refractive index of the gemstone is read through the ocular of the refractometer. The refractive index is an important parameter in classifying a mineral or gemstone. Each mineral has its typical refractive index, due to its chemical composition and crystalline structure. Our gemstone refractometers are characterised by their particularly sharp image and good readability. With the sodium filter that only lets through light with a wavelength of 589 nm, the refractometer can be used as a mobile unit with an ordinary light source or with sufficient ambient lighting. LED illumination with a wavelength of 589 nm is available.

ER601 Compact professional refractometer with LED illumination or sodium filter.

ER604 Standard gem refractometer with sodium filter and LED illumination available separately.

Copyright 1996-2010