Lesson 1: The Dichroscope

Step 3: Practical Gemology

Lesson 1

A dichroscope is one of the most useful instruments a gemologist can have. Its primary purpose is to determine the pleochroism of a gem. This can be a valuable piece of information in determining a gem’s identity. While you can observe pleochroism with a polariscope, it is much easier to see with the dichroscope.

The dichroscope also helps by confirming other test results. Occasionally a refractometer or polariscope will give ambiguous readings. The dichroscope can clarify that information. For example, it is often difficult to tell if you are seeing anomalous double refraction (ADR) in red and purple stones. If you find pleochroism with the dichroscope, you can be sure the stone is doubly refractive. It can also distinguish between a uniaxial or biaxial gem, something that cannot always be determined by other instruments.

See Using a Polariscope for more information …

Every Gemstone Is Unique - Here's How The Experts Evaluate Them

in this training-course, discover the tools, tests & valuation process used by expert gemologists for colored gemstones, opals & diamonds

Course: Hands-On Gemology: Gemstone Identification Grading & Testing
Purchase Course: $79.00
Skill Level: Intermediate - Advanced
Lessons: 60
Time: 480 min