GR-701 Gem Refractometer (Silver) w/ Built-in Light Source + RI Oil

  • 0% OFF
  • Regular Price


Add to Wishlist

Check shipping / delivery time for your country | Free Shipping Worldwide Request for Quotation

Model: GR-701


The GR-701, commonly known as Gemstone Refractometer, is the primary and most powerful tool in identifying and authenticating polished precious and semiprecious gemstones and also observing the optical properties and the structure of gemstones. This model is just as good as the expensive models used in gemological institutes, it has a built-in light source and with the aid of the Contact liquid (RI Fluid), which creates an optical contact between the glass and the gemstone, you can measure or test the Refractive Index of faceted stones, its transparency or opacity, and its beauty, durability and scarcity.


The refractive index (RI) of a gemstone provides the single most important piece of information to a gemologist seeking to identify an unknown stone. Due to its chemical composition and crystallization structure, each gem has a typical refractive index. In fact, you can also use this tool to measure R.I. for many minerals in crystal form as long as the crystals have a flat and polished face. Through these parameters, you can determine whether the gem is a Single Refraction (Isotropic) or Double Refraction (Anisotropic or Birefringence).




  • 2 years warranty
  • Convenient & easy to carry
  • With built-in light source that makes it a carry-and-use-it-anywhere device
  • A bottle of Refractive Index Fluid is provided
  • Approved by strict quality and safety standards
  • Undoubtedly durable and very reliable


  • Measuring Range: 1.30 – 1.81 RI
  • Minimum Graduation (RI): 0.01 RI
  • Illumination: Internal illumination with momentary switch
  • Size: 35mm x 63mm x 115mm
  • Scale Division: 0.01 nD
  • Weight: 0.4 kg
  • Ranges of Application: Laboratory, Gemology
  • Filter: Polarizing filter
  • Power Source: 1.5V x3 button batteries

Set  includes:

  • Small Vial of 1.800 Refractive Index Oil
  • Polarizing Filter
  • 1.5V x3 button batteries
  • Pouch Case
  • Refractometer Index Reference List (For 77 common gemstones, i.e. Calcite, Jadeite, Quartz etc.)
  • 1 x English User Manual

Related Products