Only 2 per cent of gem-quality diamonds are coloured, and of these, one in 30 million of these diamonds are blue – it’s no wonder then that the vivid hue and incredible rarity of blue diamonds have captured the imagination of magpies. 

Most diamonds sport a secondary hue, which intensifies the beauty of the stone. Here, this World of Diamonds 1.01-carat blue diamond, which the owner of the Concourse Skyline Penthouse will get to call theirs, sports a lovely secondary green shade, that scintillates with limpid brilliance. 

It’s no surprise that the price for blue diamonds is rocket-high, commanding at least US$2 million per carat. According to Diamond Investment & Intelligence Centre, only 58 fancy intense, 50 fancy vivid and 13 fancy deep blue diamonds have appeared in Sotheby’s, Christie’s and Bonhams auctions since November 1999.