Spotlight on the gem world: Three unique red diamonds.
Natural fancy red colours are the rarest and most expensive diamonds of all. Only a very few stones exist worldwide, and laboratory certificates grading the hue as pure red, without another colour modifier (such as purplish), are almost unheard of. Pink diamonds are also reds, but with low colour saturation. At the opening of this year’s Argyle mine pink diamond tender in Sydney, Rio Tinto unveiled these three luscious rocks. Out of the millions of carats mined last year, only 64 stones made it into the fancy colour tender, since most of the mine’s production consists of small yellow/brown stones, cut in India and marketed as cognac and champagne diamonds. Many moons ago we did a post on Argyle pink diamonds, whose deep colours are only found at this mine, it’s available at http://tinyurl.com/lfc4cxw.