Sales at latest auction of rough emerald hit £22m at £42 per carat.
Changes create greater purchasing flexibility for non-Sightholders.
Free seminar to discuss gem identification challenges across Japan.
Rare gem discovered in South African mine will enter market from July.
Oculus Rift technology offers unique experience for diamond industry.
CEO Stephen Lussier says figure is milestone for De Beers brand.
Has "several formal and legal evidences" to say he still owns diamond.
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Brand and celebrity couples launch Wishlist in Leeds and Birmingham.
Men reporting to Scotland's public prosecutor relating to £250k raid.
Laura Vann on balancing business with contemporary branding.
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