Congrats are in order as Billie Eilish‘s brother and collaborator, FINNEAS, is engaged to his longtime girlfriend, Claudia Sulewski!

The couple shared their happy news via a carousel of Instagram pics in which her ring is on full display, and it is a stunner.

The post quickly racked up more than 1,000,000 likes and fans have been gushing over the beautiful sparkler FINNEAS, whose real name is Finneas O’Connell, proposed with.

Now, Neil Dutta, Managing Director of the jeweler Angelic Diamonds, has taken a closer look at Sulewski’s rock and shared all the details, including how much it’s worth.

Dutta told Showbiz Cheat Sheet that “FINNEAS has chosen a very striking ring for his fiancée. It’s a classic oval-cut diamond solitaire set on a slim yellow gold band, which allows the stone to take full focus. Judging by scale in the photographs, the diamond looks to be between seven and nine carats. A stone of this quality and size would be valued in the region of around $365,000 to $550,000.

“The oval cut is a clever choice. It gives excellent finger coverage and elongates the hand, while the rounded edges make it more practical for everyday wear than shapes with sharp corners. It’s also a cut that tends to sparkle beautifully because of its larger surface area.”

Dutta concluded, “The decision to pair the oval with a simple gold band makes the ring feel both timeless and modern. Yellow gold adds warmth and gives the diamond a brilliant contrast, so the stone stands out even more. This kind of design relies entirely on the quality of the diamond rather than on elaborate settings, which makes a confident statement in itself. It’s the type of engagement ring that will photograph incredibly well and stand the test of time, which is likely part of the appeal when a couple is so often in the spotlight.”