Diffraction Grating Gem Spectroscope
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Inspection & Measurement
Gemological Instruments
KYG1617
Presidium Refractive Index Meter II
Presidium · PRIM-II
Digital refractive index meter for rapid identification of diamonds, moissanites, and colored gemstones across a broad R. I. range of 1. 000–3. 000.
Inspection & Measurement
Specifications
| Measurement Range | 1.000 – ~3.000 R.I. |
|---|---|
| Display Type | Digital index LED display |
| Gemstone Holder | In-built 8-piece holder |
| Refractive Chart | Removable reference chart with values for 55–57 gemstones |
| Power Supply | 1 × 9 V alkaline battery (approx. 3 hours use); USB port (adaptor not included) |
| Operating Temperature | 18 °C – 27 °C (65°F – 80°F) |
| Storage Temperature | 10 °C – 51 °C (50°F – 124°F) |
| Length | 140 mm (5.50 inches) |
| Width | 80 mm (3.15 inches) |
| Height | 33 mm (1.30 inches) |
| Weight | 140 g (4.94 oz) without battery |
| Software Features | Database for 50+ gemstones; Gemstone dictionary for 57 stones; Supports property-based identification |
| Connectivity | USB port for alternative power and data connection |
Overview
Highlights
- Measures wide R.I. range (1.000–3.000) for diverse gemstones–beyond traditional analog refractometers.
- Instant digital R.I. readings and no liquid handling required for fast, clean testing.
- Built-in gemstone holder, removable index chart, and software database for over 50 gemstones.
Applications
- Rapid identification of diamonds, moissanites, and common simulants in jewelry stores.
- Gemstone sorting and verification in gemological laboratories.
- Field gemstone testing at shows, markets, or during appraisal services.
Overview
The Presidium Refractive Index Meter II is a digital desktop tester designed for precise measurement of the refractive index (R.I.) of gemstones. Operating without the need for messy R.I. liquids, it provides instant, direct R.I. readings for a wide range of gemstones—including diamonds, moissanites, and other diamond simulants—covering a broad range of 1.000 to ~3.000. This extends measurement capabilities beyond traditional refractometers, enabling accurate identification even for stones with higher R.I. values.
Featuring an intuitive digital display, built-in 8-piece gemstone holder, and a removable refractive index comparison chart, the PRIM II streamlines gemstone testing. Integrated software and a gemstone database allow users to reference properties like color, S. G. value, and hardness for over 50 stones. A USB port offers alternative power and connectivity. Its compact, battery-powered design is suitable for laboratory, retail, or field gem identification scenarios.
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