(IDEX Online) - The largest purple-pink diamond ever offered at auction sold yesterday for $29.3m, a record high price but far short of its $38m high estimate.The 15.81-carat type IIa IF diamond (pictured) was named the Sakura Diamond because it perfectly matches the petals of the Sakura cherry blossom.It was the highlight of a Christie's Hong Kong live auction.The previous auction record for a purple-pink diamond was set last November by Alrosa's 14.83-carat, internally flawless, oval-cut The Spirit of the Rose, which sold for $27m at Sotheby's in Geneva.Vickie Sek, chair of Christie's jewelry department, said the sale was an "important chapter in jewelry auction history".Only four per cent of pink diamonds have a color deep enough to qualify as 'fancy vivid'. Fewer than 10 per cent of pink diamonds weigh over 0.2 carats.