The De Beers Millennium Jewel 4 is a 10.10-carat diamond. Photo: Dickson Lee

Largest oval fancy vivid blue diamond ever to appear at auction to debut in Sotheby’s Hong Kong sale

De Beers Millennium Jewel 4 estimated to fetch up to HK$280 million

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The De Beers Millennium Jewel 4 is a 10.10-carat diamond. Photo: Dickson Lee
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