When it comes to sustainability, there is no choice more ethical than antique and vintage. It reduces the industry's carbon footprint as the stones have already been mined, the materials already sourced, and the workmanship already completed. Celebrities like Kate Middleton (who now wears Princess Diana's iconic engagement ring), Kate Moss, Miranda Kerr, and Olivia Wilde have all gone the vintage-engagement-ring route, wearing rings that couldn't be more unique. Not only is there a deep history with antique and vintage rings, but the quality and the workmanship is largely unmatched today. What's more, it's a sure bet that your most prized possession will be truly one-of-a-kind, set decades or centuries ago.