Yes, a single woman can wear a ring on her left hand. No hard and fast rule says the left hand is reserved only for engagement or wedding rings. In fact, many women wear rings on their left hand as a fashion statement, to express their individuality, or simply because they like how it looks.
It’s worth noting, however, that in some cultures or traditions, wearing a ring on the left hand may be associated with a specific meaning or symbol. For example, in some Eastern European countries, a ring worn on the left hand may indicate that the wearer is married or engaged. In contrast, in some Western cultures, a ring worn on the left hand may be associated with romantic love or commitment.
The decision to wear a ring on the left hand is personal and can depend on individual preferences, cultural norms, and other factors. As long as the wearer is comfortable with their choice and understands any potential meanings or implications associated with it, there is no reason why a single woman cannot wear a ring on her left hand.