🔹 Product Description
Price $89.99
Professional Gemstone Refractometer with Built-In Light Source
This precision gemological refractometer is designed for accurate identification and analysis of polished gemstones. Built for both professionals and enthusiasts, it delivers dependable, lab-level performance in a compact, durable design.
🔍 Accurate Gem Identification
Measure the refractive index (RI)—one of the most critical optical properties used to identify gemstones. Each gemstone has a unique RI, allowing you to distinguish between natural, synthetic, and imitation stones with confidence.
💡 Built-In Illumination
Equipped with an internal light source and momentary switch, this refractometer eliminates the need for external lighting, ensuring consistent and convenient readings in any environment.
⚙️ Durable & Professional Construction
Crafted from heavy-duty metal with scratch-resistant optical glass, this unit is built for long-term reliability and precision use in professional settings.
📊 Specifications
- Measuring Range: 1.30 – 1.81 RI
- Minimum Graduation: 0.01 RI
- Scale Division: 0.01 nD
- Illumination: Internal light with momentary switch
- Filter: Polarizing filter included
- Power Source: 3 × 1.5V button batteries
- Material: Durable heavy metal body + scratch-proof glass
- Size: 30mm × 70mm × 130mm
- Weight: 0.4 kg
- Applications: Laboratory use, gemology, jewelry evaluation
🧪 Operating Instructions
- Open the upper cover and clean both the gemstone and prism surface with alcohol.
- Place the instrument on a stable work surface.
- Apply a small amount of refractive index liquid onto the prism surface.
- Gently press with a thin glass bar to evenly spread the liquid (avoid excess or insufficient amount).
- Place the gemstone (flat polished surface down) onto the prism.
- Lightly press to ensure proper contact, allowing the liquid to spread evenly.
- Close the upper cover.
- Press the light switch to activate the internal illumination.
- Adjust the eyepiece (diopter) until the image is clear.
- Observe the light/dark boundary line—this position on the scale indicates the gemstone’s refractive index.
📦 Package Includes
- 3 × 1.5V Button Batteries
- Polarizing Filter
- Protective Pouch Case
- Refractometer Index Reference List (200+ gemstones, including Calcite, Jadeite, Quartz, etc.)
- User Manual
✔ Why Choose This Refractometer?
- Built-in light for ease of use anywhere
- Accurate, repeatable measurements
- Strong, durable construction for long-term use
- Ideal for professionals, students, and jewelry businesses
