Pink emission caused by the presence of trace-element magnesium was seen only with fiber-optic light. This stone does not react to fluorescent light. Trace-element chemistry measured by laser ablation ...
Vivid blue, green, and purple-to-violet cuprian elbaites, renowned in the gem trade as “Paraíba” tourmalines, continue to be recovered in small amounts from northeastern Brazil. Since the initial ...
The history of this rare stone is documented in Paraiba: The Legacy of a Color, written by Kevin Ferreira, a gemologist and specialist in this specific tourmaline through his family's involvement ...
The history of this rare stone is documented in Paraiba: The Legacy of a Colour, written by Kevin Ferreira, a gemmologist and specialist in this specific tourmaline through his family’s ...
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