a heart sparkle is like having a crush, but it’s not that far yet. when you’re starting to talk to someone and think you might like them, but don’t necessarily have a full-on crush it’s a heart sparkle.
A fluttery feeling in your heart akin to finding diamonds after a while of strip-mining. You might feel a heartsparkle when seeing your crush, petting your dog, or just enjoying your life enough to get giddy about it.