Professional Gemological Refractometer

The Gemological Refractometer is considered by many to be the most important of all gem testing instruments. The primary use of the refractometer is to measure the angle at which light traveling through the stone is bent or refracted. This is called the Refractive Index (RI). As the Refractive Index is usually different for different gemstones, this provides an important clue for accurate gemstone identification.

The Gemological refractometer also can be used to determine whether or not a stone is single or double refracting. For a doubly refracting stone, based on the difference between 2 readings you obtain from the refractometer, strength of the gemstone's double refraction (birefringence) may be computed and it offers an important gem identification aid, as it differs from gem to gem.

The refractometer is also one of the few instruments able to give you information for opaque stones as well as for transparent stones.

The quality of the instrument is vital to the performance of consistent and reliable tests for years to come.

Our refractometer has an all-metal construction with a built-in LED  light (no flashlight or any other light source required) and a polarizing filter, allowing you to perform all the necessary tests. It comes with a soft vinyl case with a belt loop for convenience while traveling and with a hard case for safe storage.

Features:

• All-metal quality construction
• Built-in LED light source with 3 x 1.5v batteries - included
• Accuracy: 0.01
• Measurement range: 1.30 - 1.81
• Polarizing Filter
• Weight: 0.9 lb
• Application: Gemology
• Hard and soft cases are included

RI liquid is not included and can be purchased separately