While solitaire rings are a huge '90s trend, in line with the minimalist aesthetic of the decade, the angular emerald-cut diamond is one that has deep Art Deco roots. With a single stone on a clean shank, you will have a sentimental ring that will stay classic forever. What's more, this favourite is befitting of every budget, as the style itself has nothing to do with the stone's size. Go big with a statement stone like Sofia Richie's or opt for a smaller single emerald-cut instead.