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'Flawless' white diamond could fetch over $33 million

Nick Ansell | PA Images | Getty Images A white diamond billed as the largest and purest of its type to come to market is expected to sell for well over $33 million. Sotheby's auction house says the 102.34-carat gem mined from Botswana "is the only known round brilliant-cut diamond over 100 carats perfect according to every critical criterion" - carats, color, clarity and cut.