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10/30/2012 at 09:00 AM ET

justin timberlake 600x450 All About Justin Timberlake and Jessica Biel’s Wedding RingsMichael Muller; Inset: Kevin Mazur/WireImage

When Justin Timberlake proposed to Jessica Biel atop a mountain in Big Sky, Mont., last December, it was a day he’d been planning for quite some time.

The singer-actor worked with Leor Yerushalmi of The Jewelers of Las Vegas to create the perfect, most “personal” engagement ring he could, he tells PEOPLE.

The end result? A stunning 18-karat white gold and black rhodium plated creation. The center stone, a square hearts and arrows diamond, is surrounded by round diamonds and features one aquamarine on each side. They’re a thoughtful addition: aquamarine is Biel’s birthstone.

When it came to designing wedding bands (above) for their Oct. 19 Italian nuptials, the couple turned Yerushalmi yet again and collaborated with the jeweler on complementary designs.

Timberlake’s band is a simple yellow-gold domed band with a hammer finish. Biel opted for something slightly different, choosing to have four stackable wedding bands, though she only wore one when exchanging vows on her big day.

Two of the bands (all are the same in diameter) are white gold with a black rhodium finish and have diamonds set all the way around. The remaining two are yellow gold with a hammer finish, almost identical to Timberlake’s.

In addition to wearing jewelry of her own, Biel donned yellow pear-shape diamond drop earrings, set in 18-karat rose gold and micro-set with 96 fancy pink diamonds, from jeweler Martin Katz. For more about the Timberlakes’ big day, pick up the latest issue of PEOPLE, on newsstands now!

–Jennifer Garcia 

PHOTOS: SEE 13 AMAZING STAR ENGAGEMENT RINGS!

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