Optima Portable Color Grader Gemstone Light Diamond Grading Case This digital instrument will read

This digital instrument will read both the refractive and reflective indices of well-polished and faceted gemstones without the use of RI Liquid

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Solder copper brass pewter bronze zinc lead

Material: 45 High-carbon Steel + Alloy

Optima Portable Color Grader Gemstone Light Diamond Grading Case This digital instrument will readThis light source simulates daylight for diamond grading and has longwave UV light for fluorescence. The grooved, built in grading tray is made of near perfect white hard plastic that can be easily cleaned and will not change colour. Powered by batteries, the unit is small enough to fit in your bag or briefcase.