Singer and actress Selena Gomez showed off her stunning 4-carat marquise-cut ... Jewelry experts weighed in on the ring, which is said to be a five carat emerald-cut diamond.

Here's everything you need to know about their post-show romance and the details of Joan's gorgeous engagement ring. Chock Chapple proposed to Joan Vassos with a 4-carat engagement ring!

Blue Nile IGI Lab-Grown 0.55 Carat D-VVS1 Cushion Cut ... Diamond Engagement Ring Get this sparkly engagement ring from James Allen that weighs in at more than one carat. Check price at James Allen 4.