Using a Chelsea Colour filter to test gemstones not just Emeralds
Lazomufofe
2017-10-02
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We look at this useful filter that can be used to test a variety of coloured gems and why it became less effective at testing Emeralds. And we look at questions about Emeralds in terms of chromium, vanadium and iron being responsible for beryl being green and what makes green beryl an emerald?
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