(IDEX Online) - A "once in a lifetime" collection of Harry Winston jewelry, with over 255 carats of diamonds and a $12m valuation, is being sold at auction. The Diamond Wreath Suite includes a custom-designed necklace, earrings, bracelet, and watch, all handmade in .950 platinum and bearing the HW and Harry Winston hallmarks.The pieces are being auctioned as a single lot by Kruse GWS Auctions, in Los Angeles, USA. Online bidding is now open, live bidding is on Saturday (24 June).The suite contains 255.77ctw VVS1-VS2/D-E diamonds in pear, marquise, and round brilliant cuts, and comes with a $12m replacement evaluation report."This is a once in a lifetime, heirloom piece that truly belongs in a museum," said the auction house."We are elated to offer these one-of-a-kind artistic works by the world-renown Harry Winston. Acquiring this set could build generational wealth," said Brigitte Kruse, lead auctioneer.The total diamond weight of the necklace is 124.76ctw. The bracelet is 55.86ctw. The earrings are 26.86ctw and the watch is 48.29ctw.Pic shows the Harry Winston watch, courtesy Kruse GWS Auctions