Lot 2458. Nigerian "Paraiba-type" Tourmaline, weighing approximately 50.6 carats and measuring 26.03 x 19.85 x 15.71mm. Sold for US$ 35,000 (€29,528) inc. premium. Photo: Bonhams.

This is a large stone for the species and an exemplary one at that. Faceted as a pear-shape, a cut which beautifully displays the very high clarity of the stone. The color is an attractive blue.

Accompanied by a Gemological Institute of America report number 16940742 dated March 28, 2008 stating that the tourmaline contains copper and manganese and that the origin is believed to be Nigerian. 

Bonhams. LAPIDARY WORKS OF ART, GEMSTONES AND MINERALS, 6 Dec 2017, 10:00 PST - LOS ANGELES