We went to Mitsukoshi in Japan in Feb. and my DS picked a pearl for me. We got an 7mm white pearl which I had set into a "cage" pendant for a necklace. It is a silver pendant cage with a diamond on it, it is gorgeous!!
I'll try to post some pics later today. But, yes they do drill them, I saw another lady getting one drilled. Also, I saw 2 little girls getting them - not sure what settings they got, but they were for them, so I'll assume they DID have childrens settings!!
My DS had a blast picking the pearl for me, it was my b-day gift from him!!!
** On a side note, it gets very crowded in there as many people just want to watch....... If you are actually going to purchase one, let them know up front, so they don't just "overlook" you........... there were so many people just standing by the tank "looking" it seemed like they weren't asking anyone if they needed help....... we were waiting for someone to help us and no one did, so I had to go track the lady down while she was setting another one and tell her I wanted to purchase one!!!