Most expensive engagement ring

An expert tells us how much royal engagement rings are really worth, from Kate Middleton to Grace Kelly.

With price estimates ranging from $1 million to over $38 million, here are the most expensive celebrity engagement rings to date. See who landed at the number one spot and find out whose name popped up three times.

Today Sotheby’s London revealed what it billed as “the most valuable cut diamond ever offered at auction” and we were there for the official unveiling.

Top 10 Most Expensive Celebrity Engagement Rings

Click through the gallery to see 10 stunning engagement rings that belong to A-list celebrities including Nicole Kidman, Jennifer Garner, Angelina Jolie and more!

Before popping the big question, a man first needs to ask himself how much is he willing to spend on the engagement ring. And while some think proposals shouldn't be about the expensive jewelry, others claim the ring has to be worth between one and three-months salary.

Paris Hilton has been engaged four times. Here are all the details on Paris Hilton's engagement rings from fiancés Carter Reum, Chris Zylka, and more.

With price estimates ranging from $1 million to over $38 million, here are the most expensive celebrity engagement rings to date. See who landed at the number one spot and find out whose name popped up three times.

Love don't cost a thing...until it costs $23,000.

loversofroyalty: The ring.