In September a cushion-shaped 5.44-carat Paraiba tourmaline ring flew past its US$60,000 upper estimate in auction at Bonhams New York to sell for US$533,900. This is bidding territory more commonly ...
The gem comes in a range of colors, such as pink, red, green, blue, violet and black. This is fitting since tourmaline's name derives from the Sinhalese word "toramalli," which means "stone with ...