(IDEX Online) - A pair of matching heart-shaped fancy diamonds - a vivid pink and a vivid blue - fetched a combined price of $18.6m at Sotheby's in Hong Kong.The stones were sold as separate lots. It is not known if they were bought separately or by a single bidder.The vivid blue diamond is described as 5.04-carat fancy heart modified brilliant-cut diamond with VS2 clarity, mounted on a platinum ring flanked by two pear-shaped diamonds. It achieved more than $10.5m, including the buyer's premium at the Hong Kong Magnificent Jewels auction held on Friday.The vivid pink was a 4.49-carat heart modified brilliant-cut, internally flawless, fancy diamond on an 18-carat white gold ring flanked by pear-shaped diamonds. It achieved more than $8.1m.Total proceeds from the first live auction by Sotheby's Hong Kong since coronavirus lockdown were $56.5m. The heart-shaped fancies fetched the highest and third-highest prices.