File:Tourm92.jpg

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This traditional emerald cut weighs 3.40 carats. This rubellite is dear to my heart. I cut it when I was about 17 years old and it was given to me by a dear friend. He told me it was from Madagascar and it was the best material thing he ever gave me. I have enjoyed it for over 40 years and felt it held no surprises in its bright colorful, but included heart. I was wrong, for when I put the spectrometer's light probe to its table, a strong indication of copper appeared on the computer screen. I realize that Mn+3 (an oxidation level of manganese) can produce limited absorption at 900 nm that is similar to copper, so the determination of copper in tourmalines that are colored principally by Mn+3, can be inconclusive. I still think that this gem and about a dozen more Rubellites in my collection have copper. Their absorption graphs are significantly different than the well over 100 other Rebellites in my collection and they tend to have a brighter look,

if not a different color from the rest.

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current11:06, 18 January 2010Thumbnail for version as of 11:06, 18 January 2010400 × 600 (21 KB)Barbra (talk | contribs)
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