Diamonds for pawn or selling or to loan againstOur very own gemologist Alexandra Michell featured on Channel 4’s Posh Pawn, who estimates it to be around five carats.

Alexandra told MailOnline: ‘Brooklyn has chosen an elegant and classic design with an emerald-cut diamond solitaire set on a very fine band of platinum or white gold. ‘The central stone is approximately 5cts and appears colourless, and with a classic emerald cut, it is usually a good indication that the diamond is very clean with minimal imperfections. ‘I believe the retail price for this engagement ring could be in excess of £350,000.’