After the April engagement, the Hollywood actress shows her diamond ring at Sarajevo

It was a long way away from any Hollywood red carpet at Saturday's Sarajevo Film Festival in Sarajevo, Bosnia, making it the perfect event for Angelina Jolie to publicly "debut" her gigantic engagement ring from Brad Pitt.

"The Maleficent" actress was first seen wearing the $500,000, tablet-shaped rock (co-designed by jeweler Robert Procop and Pitt) in early April during a private viewing at the Los Angeles County Museum of Art's Chinese Galleries. When an intrepid photographer snapped the bauble, Pitt's manager confirmed the long-awaited engagement to the world.

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Since then, the 37-year-old hasn't attended any red carpet events in Hollywood or elsewhere, with Pitt attending the Cannes Film Festival solo for the first time in years.

Clad in silky, draped beige top, skinny black pants and black, peep-toe pumps, the Oscar-winning actress quietly flashed her news-making ring as she chatted with filmmakers at Saturday's event.

Named an Honorary Citizen of Sarajevo, Jolie spoke with young actors, directors, screenwriters, producers and film critics from the region about her own writing and directorial debut, the dark Bosnian War romance In the "Land of Blood and Honey."

The students, one attendee tells us, were "impressed." When asked about her humanitarian work -- Jolie is now a Special Envoy for the UNHCR -- she explained that she "wants to give something back to underprivileged people."

On Saturday afternoon, Jolie was spotted arriving to her hotel with daughter Shiloh, 6; the star and Pitt and their brood of six have been staying in London while she shoots "Maleficent" at Pinewood Studios.

What about the wedding?

"We actually, really and truly, have no date," Pitt told reporters at Cannes in May. "It's just something that makes sense to us, and certainly date-wise, it's just a rumor. We're still hoping that we can figure out marriage equality in the states before that date."

Who made Jolie's diamond engagement ring? 

It was prepared by Procop, a respected private jeweler and an authority on diamonds and rare gemstones. Procop has been the private jeweler to Jolie for over a decade. In 2010, the pair unveiled the "Style of Jolie" - a collaborative jewellery collection, the proceeds from which benefit children in need around the world via  Jolie's charitable foundation the Education Partnership for Children of Conflict.