Back to IGS | FAQ | Contact

Mini-Quiz for October 1st Newsletter


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


I should say : most probably a synthetic gem


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


silk inclusions


) A synthetic gem