Jennifer Aniston vs. Angelina Jolie: Compare Their Engagement Rings!

Jennifer Aniston and Angelina Jolie Jason Thomas/FilmMagic;

Jennifer Aniston and Angelina Jolie are both rocking out in 2012!

In Santa Fe, New Mexico on Saturday, Aniston, 43, finally offered a glimpse of her huge engagement ring from Justin Theroux, who proposed back in August.

"It looks like a radiant cut center diamond, approximately 8 carats," jewelry designer Peter Meksian from Michael M. tells Us Weekly of the We're the Millers star's new bauble. And it appears that sexy screenwriter-actor Theroux, 41, didn't spare any expense for his love of a year and a half. Says Meksian: ""Estimated price tag for a top quality diamond of this size: $500,000."

Aniston's first husband Brad Pitt, meanwhile, proposed to longtime love Jolie, 37, this past spring with a stunner he helped design with jeweler Robert Procop: a tablet-shaped diamond engagement ring estimated at a 16 carats and also worth an estimated $500,000.

Pitt, 48, proposed with all six of their kids present. "Angelina cried and smiled," a source told Us Weekly. "Everyone hugged once she put [the ring] on. She went around and showed it to each of the kids."

Aniston was similarly weepy when Theroux popped the question in NYC over the summer. "Jen cried," a confidante told Us Weekly, adding that Theroux's proposal was "simple."

Tell Us: Whose engagement ring do you prefer?

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