De Beers Sales Volume Jumps After Price Cut
Miner lifts production plan following increase in Gahcho Kué stake.
Group opens store in London, entering European market for first time.
William Goldberg jewel carries high estimate of $2.7 million.
Revenue up 31% year on year in second quarter.
Segment, which includes Boucheron and Pomellato, records double-digit growth in third quarter.
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