New Diamond Technology claims to have produced largest man-made gem.
Letšeng stone said to represent "robust demand" for valuable diamonds.
Preliminary stats shows 20% rise in revenue and 17% production boost.
Company to provide diamond valuations for consumers trading stones.
Anna Martin to "broaden and deepen GIA's relationships with clients".
Changes create greater purchasing flexibility for non-Sightholders.
Angolan government plans to increase production by 20% to 10m carats.
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