So for David’s necklace I’m going to explain it right now. So the gem has special properties that only vampires can control they can transform into their 3 bat forms normal size, human size, and giant size, and the gem is a vampires other weakness if you break it there’s a 50/50 chance of turning into a normal human or a pile of dust, so it’s either a cure or a instant death thing and for other vampires it could be other jewelry or accessories, so that was my explaination of why does David has a gem necklace, I also drew a little blushing David so I hope you guys picture.