Dichroscope
There are quite a few types of scopes, this is one of the decent quality inexpensive ones (made in China).

It is made with Calcite (which will wear better than the ones made with film filters). This is a very simple tool to use and one that I do highly recommend for people who cut and buy natural rough

Price $64.95

Here is an article on using a dichroscope
How to use a Dichroscope

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E-mail to inquire or order: jeff@faceters.com