Presidium Electronic Refractive Index Meter II (PRIMII Refractometer)

Presidium Electronic Refractive Index Meter II (PRIMII Refractometer)
By accurately measuring the quantity of light reflected through the stone, Presidium Refractive Index Meter II is able to separate diamonds, moissanites and other colored gemstones via its Refractive Index on flat surfaces of polished gemstones.
BrandPresidium Instruments
Weight1 lbs
AvailabilityIn Stock
Your Price:
Sale Price:$269.00

New Product!

Unlike a traditional refractometer, PRIM II is able to measure the range of RI value from 1.000 to ~3.000, therefore covering the commonly known gemstones in the market, including diamonds and moissanites. In addition, a fast and easy test can be done, without the inconvenience and messy usage of RI liquid.

The new software enables the user to further eliminate the list of possible colored gemstones by entering known values such as color, hardness and S.G. value. Further information regarding gemstone properties, common found locations can also be easily found.


  • Identifies diamonds, moissanites, and gemstones instantly
  • Continual elimination of the possible gemstones through values such as via R.I., Color, Hardness and S.G.
  • Tests on transparent gemstones, with flat polished surface
  • Ideal for separation of gemstones
  • Speed up on the identification of gemstones in parcel
  • RI liquid not required
  • Consistent and reliable results every time
  • Clear and visible display for ease of reading measurements
  • Light and compact tester that can be used anywhere


  • PRIM II Software
    • An enhancement to enable users to further eliminate the list of possible colored gemstones by entering known values such as color, hardness and S.G. value.
    • Powered up by USB
  • Gemstone Dictionary
    • Contains 57 gemstones' properties (R.I, Color, Hardness, S.G. Value), country of origin and related information
    • Serves as a quick and easy reference guide
  • Refractive Index Reference Chart
    • Refractive Index List for the common gemstones in the marke
    • Direct RI display panel
    • Instantly displays the RI value of the stone

Technical Specifications

  • Dimensions: 140 x 80 x 33mm (5.5" x 3.15" x 1.3")
  • Weight: 140g (0.50lb)
  • Power: 9V batteries / USB powered or AC adapter (optional item provided by Presidium)
  • Battery Life: Up to 3 hours of continuous use based on alkaline batteries
  • Visual Signals: Refractive Index (R.I.) value
  • Operating temperature: 18ÁC-27ÁC (65ÁF-80ÁF)

Package Contents

  • Presidium Refractive Index Meter II
  • PRIM II CD-Rom
  • Protective carrying case
  • User handbook
  • Warranty card

Optional Items

  • Presidium Universal Adapter

Please note, that the digital refractive index meter operation is similar to the operation of an optical refractometer, thus the testing of mounted stones may be difficult or impossible. Mounted gemstones could only be reliably tested if no part of the metal setting is located above the stone facet being tested (normally the table).

Presidium Refractive Index Meter II, promises to provide an easy and convenient way for the user to measure the R.I. of the gemstones. Moreover, further elimination of the identity of the gemstones will be possible with the entering of known values such as color, hardness and S.G. value, via the software. A gemstone dictionary is also included in the software to allow the user to search for the different properties of the gemstone.