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 ...

Heat and irradiation treatments can also enhance or alter the colors of topaz, making it one of the most versatile and widely treated gemstones on the market. Tourmaline is one of the most ...

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 ...

However, that ring — an oval-shaped tourmaline stone accented by a platinum band — took a backseat to a second ring she wore with the look. The jewelry, which appears to be a diamond ring ...