Blue diamond's £6million sparkle: Rare gem breaks world record as it is sold at auction

One of the rarest diamonds on the planet has been snapped up for a dazzling £6.2million - smashing the previous world record by half a million.
The one-of-a-kind blue stone, weighing 5.30 carats, fetched £1.18million ($1.8million) per carat after going under the hammer at luxury London auction house Bonhams on Thursday.
Excitement for the item spilled over as international traders battled to take home the gem set in a ‘Trombino’ ring, eventually selling for six times its original estimation of £1million.
 
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