Stone set to be auctioned at December ruby auction in Singapore.
US diamond jeweller adjusts pricing on jewellery as sales drop 1.3%.
Angolan government plans to increase production by 20% to 10m carats.
Rough ruby and corundum gems sold in Singapore for US$18 per carat.
Mobile Buyer Guide app offers visitors an interactive exhibitor guide.
The pear-shaped diamond was purchased by Harry Winston for £14m.
Company reports unprecedented bidding for white and fancy colours.
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