Letšeng stone said to represent "robust demand" for valuable diamonds.
Oculus Rift technology offers unique experience for diamond industry.
Company reports unprecedented bidding for white and fancy colours.
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.
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