Los Angeles: Actress Amber Heard has been spotted with a ring on her engagement finger, sparking speculation she could marry her beau Johnny Depp soon.The 27-year-old was spotted with a huge diamond on the ring finger when she entered a restaurant here Monday.Eonline.com reports that Amber and another woman dined at Ago, and when she left she did everything she could to shield her left hand from photographers. She even waited for a valet driver to open her car door so she didn't have to show her ring finger.Amber and Depp first met in 2011 on the sets of “The Rum Diary”, but they started dating after Depp parted ways from his partner of 14 years Vanessa Paradis, with whom he has two children - Lily Rose,14 and Jack, 11.