The Operating Principle Of A Refractometer Is Based On Total Internal Reflection. The Refractive Index Is A Very Important Optical Parameter, And The Characteristics Of Gemstones Can Be Determined Based On This Parameter.

Jade
A gemstone refractometer is suitable for identifying polished finished products.

Jadeite can be tested to determine whether the jadeite's refractive index is accurate.
This is consistent with its numerical test of 1.66 and is necessary for protecting jadeite.
It is a flat raw stone with a thickness of at least 3 mm.

Hetian Jade
A gemstone refractometer is suitable for identifying polished finished products.
Hetian Jade can be tested to determine whether the hetian jadeite's refractive index is accurate.
It is a raw stone that meets its numerical test of 1.61.

Diamond
A digital gemstone refractometer for identifying natural diamonds
And artificial diamonds, the refractive index reaches 2.417.
However, diamonds with a refractive index between 1.98 and 2.2 are all artificial. Diamond, also known as cubic zirconia

Specifications:
Product name: Digital Gemstone Refractometer
Measuring range: refractive index 1.300-3.000
Measurement error: + -0.005
Measurement accuracy: 0.001
Approx. Measurements per Charge: ~10000
Power supply: 700mA Lithium Battery
Size: 135 x 78 x 24 mm (5.31" x 3.07" x 0.94")
Weight: 250g (0.55 lbs
Package Size: 18*15*7 cm
Gross Weight: 655g

Package Include:
1 * Gemstone Refractometer
2 * calibration Block (1*1.487,1*1.806)
1 * Aluminum Box
1 * Tweezers
1 * Countertop cover
1 * Instruction Manual