updated 04/15/2012 AT 10:00 AM ET
•originally published 04/16/2012 AT 8:00 AM ET
“Brad had the vision” for the custom-cut engagement ring, Beverly Hills jeweler Procop tells PEOPLE in this week’s engagement special cover story. Check out the stunning sparkler – with diamonds set on a band of yellow gold – in a close-up photo.
An independent expert tells PEOPLE that the ring could weigh in at more than 10 carats total, with a price tag of $1 million.
Jolie, 36, quietly debuted the ring at a private event at the Los Angeles County Museum of Art on April 11.