Jennifer Aniston is planning to take her second trip down the aisle, and nothing says true love like a humongous, pricey diamond ring!

Actor Justin Theroux popped the question to Aniston back in August, and ever since, celeb watchers have been eagerly awaiting the first appearance of an engagement ring. The wait is over, because the happy couple was spotted on the set of Aniston’s upcoming film “We’re the Millers” in Santa Fe, New Mexico, and the actress was flashing an enormous sparkler on her left hand.

How enormous? Jewelry designer Peter Meksian estimated the main stone at 8-9 carats. He told Celebuzz, “looking at the ring, it’s a basic solitaire and a beautiful diamond,” Meksian priced the ring at about $500,000.

Chris Capri of Capri Jewelers gave more details to E! News, calling the ring “a classic looking yellow gold custom solitaire ring…in the 12 to 18 carat range” with “micro-pave set diamonds surrounding the center stone.”

Not-so-coincidentally, $500,000 is also the estimated price tag on the 16-carat ring that Aniston’s ex Brad Pitt designed for his current fiancée Angelina Jolie.