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Birefringence for Faceters
Dr. Brad Amos has placed his Birefringence article, parts 1, 2, 3 & 4 on his website: These can be viewed by clicking the link below:
Brad Amos's Website

These articles were serialised in Faceters' Stonechat Newsletter Issues 60, 61, 62 and finally in Issue 64 (Not in 63)

Gemology Courses:

I was recently contacted by Paul Gian who has published an article on gemology courses and made resources available (some of which are free). There is loads of infirmation on his website which can be accessed by clicking the link below: