Rare Coloured Diamonds
Every once in a while a gem stone comes up at auction that threatens to break the sale record for a particular stone. In November Blue Moon diamond goes under the hammer at Sotheby’s in Geneva. If the flawless cushion cut Blue Moon matches its presale estimate of $56 million, it will become the most expensive gem ever auctioned.
Ian Gallachers Blog
Diamond Jewellery News
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