Just like how someone's texting habits can reveal their feelings for you, emojis have their own language beyond words. Yes, the color of the heart emoji you send actually means something beyond personal color preference. In fact, sending an orange heart could say a lot more about you and what you want than you may have even considered.
The orange heart emoji is all about being casual. Unlike the red heart, which should be saved for only your partner and best friends, the orange heart is more for friends with benefits, occasional hookups, and casual dating in general. It can be part of an aesthetic too, for instance, if you're curating a perfectly tangerine Insta feed. Of course, sometimes an orange heart is just an orange heart.
However, if you want something more serious with your current situationship/talking stage/haven't-yet-defined-it relationship, you may want to think about using a different color heart emoji so that your romantic intentions are clear.