Sapphire ringOur in house gemologist Alexandra Michell of Channel 4’s Posh Pawn, commented: “Coloured gemstones are becoming more popular again.

“They had their boom in the early eighties when Prince Charles and the then Lady Diana Spencer became engaged.

“The ring, which is now the engagement ring of the Duchess of Cambridge, renewed a sales boom in sapphire and diamond rings in 2010 when the royal couple engaged, features a stunning Sri Lankan 12 carat cornflower blue oval faceted sapphire surrounded by 14 round brilliant cut diamonds and set in 18-carat gold.

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