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$99.99 Gemstone GEM Refractometer - Gemology Gemologist GIA


  • $ 9999

RGM-700 Portable Gemological Refractometer w/ a 3.6ml Vial of 1.800RI Fluid

Comes with EASY TO FOLLOW instructions!  Written by our staff, not converted from another language!

Comes with a Gemstone Refractive Index Chart!

Comes in a black zipper case!

Comes with 3.6ml of 1.800 Refractive Index Fluid - MORE THAN ANY OTHER SELLER!

Product Specs:

Range: 1.30-1.81 Refractive Index (RI)
Resolution: +/- 0.01 RI
Accuracy: +/- 0.01 RI
Dimension: 4.5" x 1.5" x 2.5"
Weight: 400 Grams
Sturdy, Portable Design made of die cast aluminum, not plastic like the GIA ones

Perfect for the GIAStudentHobbyist AND Professional!

This item is an exceptional Value!  Quality Unit, Right RI Fluid!


The RGM-700 Portable Gemological Refractometer in a Black Vinyl Zipper Case in a sturdy hard case. This handy little piece of equipment tests a gemstone's ability to slow down or bend light. The amount of slowing down it does to a beam of light is called the refractive index. THIS UNIT WILL HELP YOU DETERMINE WHICH GEMS ARE REAL AND WHICH ONES ARE FAKES! 



This unit is helpful in Testing for Cabochons, as well as, testing for Double Refraction!

How does it work?: The refractometer works by the use of a glass hemicylinder inside that has a flat surface extending into the body of the refractometer. When light is introduced into the back of the unit, it travel through the glass hemicylinder and up to the gemstone, where the stone is in optical contact with the glass by use of a refractive index liquid. This liquid keeps air from between the stone and the glass hemicylinder and allows light to travel at the same speed through the glass, gets refracted by the gemstone, and then back through the glass hemicylinder to the viewing lens. The amount of slowing down or bending of the light that the gemstone does to the light beam, causes a light and dark area joined by a thin green line. This green line is the refractive index reading of the gemstone.

Competitively Priced!

This type of unit sells for $595.00 and up at most retailers. Get yours today at Wholesale prices!

Included are:
* Black Vinyl Soft Case
* Polarizing Filter
* Monochromatic Light Filter
* Internal light - Standard wavelength 589nm - runs off (3) 1.5 volt button cell batteries (included)
* 1.8ml Vial of 1.800 Refractive Index Oil 
* Users Guide, BEGINNERS HOW-TO Guide
* Gem Chart - 140+ stones on it!



High Quality!

The RGM-700 comes with a 5 year warranty against any defects, so you can buy with total confidence.  This unit is made of die cast aluminum and has a smooth finish.  It is not made of plastic like the $600 units out there! 


For inquiries about this product, please contact us at the e-mail address below.

National Industrial Supply
30777 Rancho California #891420
Temecula, CA 92589, USA
Sales: 951.308.9269
Fax: 310.733.5480  -  E-mail -  -  Website:

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