ER601 & ER604 Gemstone Refractometers
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Top > Refractometers > ER601 & ER604 Gemstone Refractometers |
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ER601 & ER604 Gemstone Refractometers
SKU: ER604
Prices from: $435.00
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ER601 & ER604 Gemstone Refractometers Description
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These gemstone refractometers are offered either as a compact professional or standard version. They both provide a sharp image and good readability, and have the option to select LED illumination or ambient light with a sodium filter.
Gemstone refractometers are used for the classification and quality control of gemstones. The gemstone 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. Gemstones with a high RI are generally more brilliant, ie a diamond has a RI of around 2.4, whereas quartz approximately 1.55. 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 is also available with a wavelength of 589 nm.
Both gem refractometer models are constructed of cast aluminium, and are supplied complete with a polarisation filter and manual.
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