Dear friend, I make a presentation regarding the identification of Natural blue spinel colored by cobalt with the help of colored filters and UV lamp. I hope that you will enjoy this presentation.
with best regards
HUK
Thursday, September 20, 2012
Identification of Blue spinel colored by cobalt
Dear friend, I make a presentation regarding the identification of Natural blue spinel colored by cobalt with the help of colored filters and UV lamp. I hope that you will enjoy this presentation.
with best regards
HUK
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