The 'Bodak Yellow' hitmaker had removed the piece of jewellery when she split from her rapper husband Offset.
So, if the piece of jewellery is anything to go by, the couple could be hinting at a "happily ever after".
This comes after the pair were seen out together at the Ignite Angels and Devils Pre-Valentine's Day party in Bel Air, California.
Cardi had previously spoken out about why she refused to go to marriage counselling with Offset, even though they were trying to work things out for the sake of their six-month-old baby daughter Kulture.
She said: "I decided on my own. Nobody makes my decisions about my life but me. There's no counsellor or nothing that could make me change my mind."

'Spider-Man: Brand New Day' opens to a huge $927 million global box office
Producer sues Netflix for $105 million over missing Nicolas Cage movie
BTS boycott Grammys over new Asian pop award category
Daily Mail seeks interim $13 million payment after Prince Harry loses lawsuit
It's official: Guggenheim Abu Dhabi to open on December 11
