Company to provide diamond valuations for consumers trading stones.
Registration for 2015 to 2018 Sightholder period to open on August 25.
Changes create greater purchasing flexibility for non-Sightholders.
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.