An ultra-rare, 2.11-carat, fancy red diamond known as the Argyle Everglow headlines the 2017 Argyle Pink Diamonds Tender – an annual showcase of the rarest diamonds from Rio Tinto’s Argyle mine in Western Australia. The Argyle Everglow, which earned a grade of fancy red VS2 from the Gemological Institute of America (GIA), is the largest […]