Diamonds have enjoyed a boom in sales during lockdown with some wealthy investors seeking to lift their spirits with a sparkling new precious stone. Recently, a multi-coloured ‘Tutti Frutti’ diamond bracelet made by Cartier in 1930 sold for £1.1million at an online Sotheby’s auction. It comfortably beat the £650,000 estimate despite the New York auction only being open to internet bidders. Yet although diamonds can represent a good investment, they are not for the faint-hearted.