Angelina spotted wearing engagement ring

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."