"Oh, we live forever. Unless something shatters our gemstone, that is." Topaz explained to EMily, tapping the gem on his wrist. "When we came to Earth, a gem with a lot of power and influence fell in love with the life on Earth, and so we had a very long civil war that resulted in many destroyed gems and I still don't even know if we won or not because we got stranded on another planet 5000 years ago, then somehow ended up here yesterday! Isn't it just fantastic?!" As he talked he seemed to become louder and more energetic, laughing hysterically after he finished.
A few seconds later, he abruptly stopped laughing. "Sorry, I just like to cover up my overwhelming sadness with forced smiles and laughing. Can we change the subject, pretty please? Like talking about how boring science is or something?"