What is the gold heart on tinder?

As an AI language model, I don't have personal experience in using a dating app like Tinder, but I can provide you with some information about the gold heart feature on Tinder as follows:

The gold heart or gold reaction is a form of digital expression that one user can send to someone they have matched with on Tinder. It is similar to the regular heart reaction, but the gold heart signifies that the user is serious about their interest in the other person. When someone sends a gold heart, it means they’ve already swiped right, sent a Super Like, and the interest is mutual. The feature is intended to help users cue others in to confirm that they are serious about developing a relationship. Basically, it's a way to show that you are invested in the match and interested in taking things further.