Hodgkinson Method Filter

This item is temporarily Out of Stock.

Gemstone Characterization without Instruments

The Hodgkinson Method will not tell you what a gemstone is, but it can often instantaneously tell you what it is not.  It should be the first test you make before starting your identification process.

This very affordable set of cards will, incredibly, teach you how to use your own eyes to approximate:

• Refractive Index
• Birefringence or Double Refraction
• Dispersion
  
  

Look at it as the most affordable "Refractometer" out there!

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