Jennifer Aniston's Engagement Ring: Emerald-Cut Diamond

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Going to the chapel: Jennifer Aniston and Justin Theroux.

Justin Theroux finally put a ring on it ... and now we know the details.

Sources tell Life & Style that Jennifer Aniston's engagement ring is quite the sparkler, boasting an estimated 8 carats.

"It's a huge emerald-cut diamond," a "friend" of the actress says. "It's a rectangle with tapered diamond baguettes on the sides. It's beautiful."

Sounds likes it. What's more, it's also a far cry from the $500,000 swirled ring ex Brad Pitt co-designed for her. Needless to say, the 43-year-old bride-to-be is over the moon.

"Just after Jen got engaged, she called all her friends and told them about it," the friend says. "She was so happy and said she loves the ring. I think she was overwhelmed and overjoyed by the size and beauty of it!"

Good work, Justin. You can stick around.