Oscar winners share their joy
"I designed the rings
worn by Benjamin Millepied and Natalie Portman. They were made with recycled platinum and conflict-free diamonds," Jamie told the magazine.
Jamie has also designed the 30-year-old actor's engagement ring, an antique diamond surrounded by conflict-free stones and made of recycled platinum.
"Ben was exceptionally thoughtful and dedicated and patient to make sure we had everything right," the jeweller added.
"We wanted everything about the ring to speak to things that are important to Natalie," he said.
Benjamin Millepied, left, and Natalie Portman arrive before the 84th Academy Awards on Sunday. (AP Photo/Matt Sayles)
The pair got engaged in December 2010 before welcoming their eight-month-old son Alephlast June.
There's no official confirmation from the couple as yet.