12 Non-Traditional Celebrity Engagement Rings

In case you didn't hear: Color is in. And that applies for engagement rings, too—the latest jewelry trend that's on the up and up. Ever since Prince William proposed with Princess Diana's famous 18-carat sapphire engagement ring that turned Kate Middleton into a Duchess, there's been a growing demand for vibrant-colored stones (engagement ring e-retailer brilliance.com recently launched a new category dedicated solely to gemstone rings). From Olivia Wilde's emerald haloed rock to Jessica Simpson's 5-carat ruby, it's clear that unconventional sparklers are having a moment. Click through to see 12 celebrities' beaus who have shopped outside the box and scooped up engagement rings in unique settings, rare cuts and more.

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Scarlett Johansson

Scarlett Johansson's fiance French journalist Romain Dauriac has unique taste! The dazzling Art Deco sparkler created a stir at the Venice International Film Festival, and rightly so-it features three round diamonds surrounded by a vintage rectangular setting with more diamonds.

Ashlee Simpson

When it came time to choosing a ring for Ashlee Simpson, beau actor Evan Ross decided to keep it within the family, selecting jeweler-to-the-stars Neil Lane who also designed big sis Jessica Simpson's sparkler. "A Vintage inspiration with a Contemporary feel using calibrated cut rubies gave that vibrant Art Deco feel," Lane says of the 5-carat marquise-cut diamond accented with rubies and 140 small white diamonds. "The navette shape evoked the romance (of the) Edwardian Era."

Olivia Wilde

This is one serious sparkler! Funny man Jason Sudeikis asked for Olivia Wilde's hand in marriage with a round diamond surrounded by an emerald halo (to match her eyes!) and set in gold.

Fergie

Fergie's engagement ring from husband Josh Duhamel features a wide band with a 4-carat brilliant cut diamond. The H. Stern design also has cognac diamonds in a starburst pattern around the center stone.

Halle Berry

Halle Berry's fiancé Olivier Martinez popped the question with a diamond and emerald Robert Mazlo engagement ring.

Rebecca Romijn

Husband Jerry O'Connell proposed to Rebecca Romijn with a 6-carat yellow diamond engagement ring. "Since I had to get my ring resized when I was pregnant, I decided to change my setting with the help of my friend Lorraine Schwartz," Romijn told InStyle. "There's something sexy about a diamond dangling from your finger."

Jessica Simpson

Eric Johnson gave Jessica Simpson a 5-carat ruby ring in honor of her July birthday. "The ruby design for Jessica was perfection," says Neil Lane, the celebrity jeweler behind Simpson's engagement ring. "It's a classic design with a twist because the side stones are pear-shaped."

Angelina Jolie

Angelina Jolie's 10-carat diamond is a one-of-a-kind cut thanks to Brad Pitt. "Brad had a specific vision for this ring," Beverly Hills jeweler Robert Procop said in a statement. "He wanted every aspect of it to be perfect, so Robert was able to locate a diamond of the finest quality and cut it to an exact custom size and shape to suit Angelina's hand."

Kate Middleton

As a sweetly romantic and commemorative gesture, Prince William presented Kate Middleton with his mother's Garrard Jewelers sapphire-and-diamond ring. He explained his decision, saying, "It's very special to me, Kate's very special to me as well, I thought it only right to put the two together." The 18-carat oval sapphire is surrounded by 14 diamonds and set in 18-karat white gold.

Mariah Carey

The 10.02-carat emerald-cut diamond on Mariah Carey's Jacob Arabo engagement ring is in her preferred hue: pink.

Carrie Underwood

Hockey player Mike Fisher asked for Carrie Underwood's hand in marriage with a yellow diamond ring by Jonathon Arndt.

Reese Witherspoon

Jim Toth popped the question to Reese Witherspoon with a rare Ashoka-cut diamond. The 4-carat ring, a custom-design by the William Goldberg Diamond Corporation, is set on a pave diamond-and-platinum band. The unique cut also has 62 displayed facets and rounded corners to make it extra sparkly.

Elizabeth Hurley

Australian cricket player Shane Warne proposed to actress and breast cancer activist Elizabeth Hurley with a square-cut sapphire flanked by two trillion-cut white diamonds.

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