The gem refractometer is the most important tool for gem determination and the most powerful instrument for identifying gem species. It measures the refractive index value of gemstones non-destructively, quickly, and accurately, while determining other critical optical characteristics.

Features a high-refractive-index lead glass test prism with a measurement range of 1.30–1.81 and ±0.002 accuracy. Built-in LED light source eliminates external dependencies. Professional optical design with narrow-wavelength quasi-single LED light delivers an ultra-flat, razor-sharp shadow boundary for precise readings. High-contrast ruler with black background enhances interface clarity for confident gem identification in any lighting condition.

Essential for gemologists, appraisers, and serious collectors seeking reliable, non-destructive gem analysis.  

Accuracy: ±0.002

Eyepiece Diameter: 16mm

Range: the refractive index is within 1.30-1.81

Function: Identify gemstones by refractive index

Battery type: Button battery (not included)

Weight: 317.5g

Size: 113mm*32mm*61mm (L*W*H)