Angelina Jolie, Brad Pitt and son Pax viewing LACMA's Chinese collection
The Los Angeles County Museum of Art/PRNewsFoto
It's the kind of bling worth waiting for.
Robert Procop, who collaborated with Angelina Jolie
on "The Style of Jolie" jewelry line
, designed her engagement ring – with a lot of help from her new fiancé Brad Pitt
"Brad had a specific vision for this ring, which he realized over a year-long collaboration with Robert," says the jeweler 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 suite Angelina's hand.
"Brad was always heavily involved, overseeing every aspect of the creative design evolution," the statement continues. "The side diamonds are specially cut to encircle her finger. Each diamond is of the highest gem quality."
Jolie was spotted wearing the ring Wednesday at a private viewing at the Los Angeles County Museum of Art's Chinese Galleries, according to The Hollywood Reporter
, who first reported on the ring.
Jolie attended the event with Pitt and their son Pax.
Rumors that Jolie, 36, and Pitt, 48, were planning to marry intensified earlier this year when Pitt told CBS News that they were "getting a lot of pressure from the kids."
"It means something to them," he continued. "We will [get married] someday, we will. It's a great idea. 'Get mommy a ring.' 'Okay, I will, I will.' "
But Jolie later told PEOPLE
at the Screen Actors Guild Awards, "I think anything said tends to be blown out of proportion."
For much more on Brad and Angelina's engagement, including wedding dress sketches from top bridal designers and an inside look at the couple's relationship, pick up this week's issue of PEOPLE
With reporting by MARY GREEN