They're one of the world's rarest jewels - but nobody knows for certain why pink diamonds are pink. That hasn't stopped investors from snapping them up at auction and sending prices skyrocketing. In October a new world record was set at a Sotheby's sale in Hong Kong when an 8.41-carat pink diamond sold for $17,768,041 (£11,438,714) - more than $2.1m (£1.8m) a carat.
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