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Sorry…It seems that I have mixed up the URL’s…
Many thanks for Fred Ward who kindly corrected me…:slight_smile:

Here are the right ones…

Tips From The Jeweler’s Bench - Update Notice


o Basic Optics Notes for Gemology

o Notes On Specific Gravity

o The Story of Red Spinel

Dr. E. Aspler
Managing Director
Ganoksin Jewelry Co.,Ltd.