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Pleochroism in Faceted Gems: An Introduction

Richard W. Hughes, October 31, 2014

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

An Update on “Paraíba” Tourmaline from Brazil

James E. Shigley, Brian C. Cook, December 1, 2001

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

Multicoloured Bismuth-bearing Tourmaline from Lundazi, Zambia

Mary L. Johnson, Cheryl Y. Wentzell, September 1, 1997

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

Interesting Red Tourmaline from Zambia

John I. Koivula and C. W. Fryer, March 1, 1985

A new source of red tourmaline is identified in Zambia.

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

John I. Koivula, Kevin Nagle, Andy Hsi-Tien Shen, and Philip Owens

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.

Spectral Differentiation Between Copper and Iron Colourants in Gem Tourmalines

Paul B. Merkel and Christopher M. Breeding

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

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