Rare blue diamond could fetch up to £2 million at auction

The ring will be sold at auction on October 1 (Elmwood’s/PA) -

A blue diamond ring of “extraordinary rarity” could fetch up to £2 million when it goes under the hammer next month.

Auctioneers Elmwood’s said the jewel will be only the third blue diamond weighing more than eight carats ever offered at auction in the UK.