First championed by John Lennon in the '60s, round sunglasses have been revived by everyone from Beyoncé to Gigi Hadid and Kendall Jenner. The perfect way to embrace the season's retro trend, this Cartier Eyewear pair has ribbed silver-plated temples and gold-plated frames that will be easy to mix with other metals. Updated with a pointed bridge, they're particularly flattering on square faces.