jajjaja se ve graciosa
You drew her really well !
Is he a original character?
Yes, she is
Brother or sister of Jasper? I have a anime original character whom human, name after Jasper. XD
Well, gems actually don't have siblings, or family, but they can be from the same type of gem and act like a family. Also, is normal that your OC's name is Jasper. There are a lot of characters named Jasper.