Gem refractometer FGR-003A


Refractive Index is one of the most important optical parameters used to identify and authenticate polished precious and semi-precious gemstones. Gem refractometer is the most important professional tool for identifying gem stones.It can test the gem refractive index easy,fast,and without spoilage,it can also determine other optical characteristics of gemstones..

High hardness Synthetic CZ test prism,Aluminum alloy table 
Built-in lithium battery,Portable Size
Scale range:1.35-1.85
Acurracy: ≦±0.003, the scale of finer to 0.005
Internally installed the monochromatic light (wavelength:589.5nm)   
Case side has the bracket to store polarizer 
2ml refractive index Liquid(1.785±0.005) with patent design bottle,can put inside the cover


Gemological refractometer



High hardness Synthetic CZ test prism

Scale range:1.35-1.85                    

Acurracy: ≦±003

Aluminum alloytable,easy to clean            

Professional optical design,shadow edge is ultra-straight and clear,easy to read; and Internally installed the monochromatic light (wavelength:589.5nm)                                  

There are two ways of inputing the voltage:2 xAAA batteries and DC3V 50mA direct current suply(AC100—240V).                                           

2ml refractive index Liquid(1.78±005) new design can put into the product covered, easy to carry.   

★Built-in lithium battery, 700 mAh, full of electricity can work more than 7 days if work 8 hours each day. With a USB charging line, connect phone charger (220 V).             

★Equipped with a polarizer;The side has the bracket of polaroid, easy to store when not in use.  

★Eyepiece: 32mm in diameter, with magnifying function;

★Portable Size,Single black bag packing

Test conditions: Temperature: room temperature 5-35°C, humidity: ≤75%, no acid, alkali and other corrosive gases in the room;

Size: 120mm×42mm×80mm;

Prism size: 14mm×4mm;

Metal table size: 37mm×68mm;

Weight: 390g;



A lightweight measuring instrument used by jewellers and traders of gemstones to measure polished stones over a refractive index range of 1.30 to 1.81 RI.

This instrument can also be used to identify whether a particular stone is Isotropic or Anistropic (uniaxial or biaxial).


Differences of all our 5 Gem refractometer Models

Model Color  Accuracy Table Material Finer Scale Built in battery  For Mounted  Stones  Two level Brightness
FGR-003 White 0.003 Aluminum alloy 1.40,1.50,… / / /
FGR-003A(Portable) Black 0.003 Aluminum alloy 1.40,1.50,… Yes / /
FGR-002 White 0.002 Stainless steel 1.40,1.50,… / / /
FGR-002J White 0.002 Stainless steel 1.40,1.50,… / Yes /
FGR-002A White 0.002 Stainless steel 1.40,1.45,1.50,1.55,… / / Yes


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4th Floor, Building B, Kelixing Industrial Park, Xiwang Industrial Zone, Tiantangwei, Fenggang Town, Dongguan City

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