Kate’s dazzling sapphire and diamond engagement ring has an estimated value of £390,000.
Steven Stone diamond expert Maxwell Stone said: “Kate Middleton’s ring, which was formerly Princess Diana’s, features a 12-carat Ceylon sapphire, originating from Sri Lanka.
“Like with most precious gemstones, the quality and value of a sapphire is graded by its colour and hue, which can range from a light, pale blue to a dark, royal blue.
“The sapphire is a deep, royal blue, of AAAA quality, making it amongst the most valuable of its kind.
source: express.co.uk