Seems to me like he just made a mistake. Some kid puts him on the spot in front of everyone, asking for the jewellery, what's he supposed to do? If he'd said no, people would have criticised him for being cruel and cold hearted. If I was that kid I wouldn't have taken it seriously, why would he just give $75,000 worth of diamonds away, to some kid he doesn't even know, whether the kid was parylised or not.
Seems to me like the parents are just gold digging because he's a celebrity and has money for them to milk.