Riotinto has sold The most valuable diamond in the 2014 collection was a radiant-cut, 1.21-carat, fancy red diamond named the Argyle Cardinal, which sold to one of the company’s exclusive retailers, Glenn Bakker Jewels, for an undisclosed amount. 

colored diamonds famous for their rarity and value. There are various colors called Fancy yellow, blue, green, red, pink. Their cost is higher than white diamond