News: Jay-z - Jay-Z gets Beyonce �2.5million wedding ring

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Although the couple married in a secret ceremony in April, the 'Bootylicious� singer had so far refused to show off the band until she was seen on a Miami beach with younger sister Solange last weekend.

The eye-catching piece is believed to be from celebrity jewellers Schwartz, a long-term favourite of the star. Mohammed Cimark, who runs Precious Gems and Jewels in London, confirmed the huge octagon-cut diamond was a rarity.

He said: 'If it is 18 carats then it�s a lovely size, an exceptional diamond. It�s clearly a premium stone.

'You can�t recognise the colour from the photo and the clarity is...