Plot twist: Grace Kelly’s iconic $4M Cartier engagement ring wasn’t the first sparkler Prince Rainier gave her! The OG ring was a Cartier eternity band with rubies and diamonds, symbolizing Monaco’s flag. Experts say it could be worth over $100k today. The massive diamond ring we all know? That came later, possibly because her movie role needed a showstopper. Either way, both rings are total royal goals! #Beauty #GraceKelly #RoyalJewels