Cheltenham jeweller hides stones around town in aid of Maggies.
CEO Stephen Lussier says figure is milestone for De Beers brand.
Company says stone was placed in possession of new owner in 2008.
Company sees revenue spike at US$65.7m in last six months of 2013.
Customer demand and prices increase in 2013 with 31.2m carats mined.
Diamonds from Letseng mine will be sold at company's February tender.
Reports to use exclusive GIA paper and QR codes from January 1.
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Bold statement pieces dominated the runways of top London designers.
Preliminary stats shows 20% rise in revenue and 17% production boost.
Holts Academy student Elizabeth Harvey scoops prize in debut contest.
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