"This ring makes a statement. It's no wonder why Maria is smiling in the photos! " jewelry expert Michael O'Connor tells UsMagazine.com.
O'Connor gives Us more details on the Grand Slam winner's bling: the center stone appears to be a cushion-cut diamond of approximately 7 to 8 carats on a thick, split-shank platinum band. See more shots of Maria's ring.
Back in August, the Slovenia-born basketball star says he and Sharapova has "helped each other" become better at their respective sports. "We both understand what the other is doing and going through, and what it takes to do well in what we do," he said of Russia-born Sharapova.