Olivier Martinez and Halle Berry
03/11/2012 AT 11:30 AM EDT
Finally making the news official, French actor Olivier Martinez confirms reports from January that he's engaged
to Halle Berry
"Yes, of course it's true," he told The Miami Herald
while promoting his new South Beach restaurant
Contrary to reports the actress had a Gurhan-designed ring, Berry's emerald engagement bling was actually designed by Robert Mazlo of Paris, whom Martinez called "a real artist" who has been making jewelry for "kings and queens for many centuries."
The Oscar-winning actress, 45, costarred with Martinez, 46, in the 2010 film Dark Tide.
They soon became an item off-screen.
Berry has been married twice before – to baseball player David Justice in the early 1990s, and to singer Eric Benét in the early 2000s – and has daughter Nahla
, who turns 4 this month, with Gabriel Aubry.