Traditionally, rings are most often used to symbolize that someone is either engaged or married. These rings, as we know, are worn on the left hand next to the pinky. Have you noticed a wedding ring on a pinky finger lately? This is what those rings stand for.
Wedding Ring on a Pinky Finger: A Different Commitment

In reality, the wedding ring on a pinky finger isn’t a wedding ring at all: It’s a promise ring, but instead of to another person, it’s a promise ring to ones’ self.

Melody Godfred and Samira Far, co-founders of Fred + Far jewelry, created the pinky ring. These rings are for all women – no matter what their relationship status – to remind them to also commit to themselves.