You’ve liked more posts than you count of beautiful engagement rings on Instagram. You’ve pinned every size, shape and colour ring onto your Pinterest board. But do you know what it takes to pick the right engagement ring? Is bigger really better when it comes to diamond sizes? We spoke with Drew Birrell, Diamond Expert and Gemmologist at Tiffany & Co. He gave us all the information you need to pick the right engagement ring as well as the most important things to keep in mind when doi