Tiffany & Co’s iPhone App, £free!

Genius idea! Tiffany has launched an iPhone App for picking the perfect engagement ring. You can browse the collections, see diamonds real-size, increase and decrease the carats but best of all, it has a ring measuring tool. Place one of your rings on the circle and select the ring sizes up and down until the circle fits your ring exactly. Bam! You have your ring size. Fashion Editor has had to schlep to H Samuel on Oxford Street endless times to measure her ring size, now she can do it on the sofa!