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Gemstones

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15 ct tanzanite
Pleochroism in Faceted Gems: An Introduction

Describes the phenomenon of pleochroism and its complex effect on the appearance of coloured stones.

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An Update on “Paraíba” Tourmaline from Brazil

“Paraíba” tourmalines continue to be recovered in small amounts from north-eastern Brazil.

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Multicoloured Bismuth-bearing Tourmaline from Lundazi, Zambia

Tourmalines from an alluvial deposit near Lundazi in Zambia consist of colour-zoned pink/colourless/yellow-green “watermelon” nodules.

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Interesting Red Tourmaline from Zambia

A new source of red tourmaline is identified in Zambia.

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Spectral Differentiation Between Copper and Iron Colourants in Gem Tourmalines
Spectral Differentiation Between Copper and Iron Colourants in Gem Tourmalines

The authors used Vis-NIR spectral measurements combined with LA-ICP-MS data to investigate the usefulness of absorption spectra.

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Solution-Generated Pink Colour Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines
Solution-Generated Pink Colour Surrounding Growth Tubes and Cracks in Blue to Blue-Green Copper-Bearing Tourmalines from Mozambique

Several transparent, faceted, blue to blue-green copper-bearing tourmalines containing growth tubes and cracks surrounded by sleeves of pink colour were examined for this report.

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