Mini-Quiz for October 1st Newsletter

Gem Related Discussion
1

You are looking at a red gem in the polariscope and see fine lines crossed at 90 degrees. You are probably looking at:

a) A singly refractive gem
b) A synthetic gem
c) Silk inclusions

2

I should say : most probably a synthetic gem

3

b. a synthetic gem - the lines indicates internal strain.

4

silk inclusions

5

) A synthetic gem