kolkata in celebration of its 40th anniversary in asia sothebys hong kong is presenting the premier blue a 759carat round brilliantcut internally flawless if fancy vivid blue diamond estimate upon request the largest round fancy vivid blue diamond ever graded by gia gemological institute of america as part of its magnificent jewels and jadeiteauction scheduled to take place on 7 october at the hong kong convention and exhibition centre the round brilliant cut is rarely used in coloured diamonds due to the high wastage involved in the cutting process although it is widely applied to white diamonds to maximise its brilliance no significant round fancy vivid blue diamond has ever appeared at auction worldwide thus making the the premier blue a rare and exceptional gem the premier blue of substantial size round brilliant cut fancy vivid blue colour grading and internally flawless clarity embodies the best and rarest attributes of a blue diamond the premier blue will be previewed around asia as well as in geneva london new york and doha before the auction quek chin yeow deputy chairman asia and chairman international jewellery asia said in an email statement sothebys has been entrusted with many important blue diamonds and holds the current percarat price record for fancy vivid blue diamond at auction with the sale of a 601carat fancy vivid blue diamond which achieved us1686505 per carat in hong kong in october 2011 this autumn we are thrilled to offer the premier blue an unusually beautiful and rare treasure of round brilliant cut as well as internally flawless clarity no round fancy vivid blue diamond of significance has ever appeared at auction the premier blue weighing 759 carats is the worlds largest round fancy vivid blue diamond to appear at auction as well as the largest one ever graded by gia a befitting celebration of sothebys 40th anniversary in asia the debut appearance of such a rare fancy vivid blue diamond as the premier blue at auction offers an unprecedented collecting opportunity for connoisseurs worldwide