Monthly Archives: April 2015

Treatment in the Name of Beauty?

In an effort to work out a problem with my spectrometer I have a few minor cuprian tourmaline gemstones out of storage.  One of the gemstones is particularly close to my heart.  I bought the rough after the great escalation … Continue reading

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When is a tourmaline with three colors not a tricolor specimen.

I love tourmaline.  It keeps coming up with exceptions to the rules/definitions. Definition.  A tricolor tourmaline has three different colors as seen from a point of view perpendicular to the principle (c) axis.  It doesn’t depend on tourmaline’s dichroic nature … Continue reading

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Paraiba/paraiba type/paraiba like, overselling provenance

Paraiba tourmaline and the broader family of cuprian tourmaline has certainly been a driver for interest in the provenance of gemstones.  The price differential between Brazilian with the proper levels of tone and color and similar  African cuprian tourmaline is … Continue reading

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