Giovanna Fletcher engagement ring: Tom Fletcher gave her £400,000 diamond ring

He said: “Based on the size and style, the stone is likely to be three-carat and the colour to be E with a VS1 Clarity.

“The retail price for this is £150,000 from a top jeweller.”

Analysing pictures of the jewel, he explained it is either a three-carat or five-carat diamond.

If it is the latter, the lavish ring could come with a much higher price tag.