CH - hallmark Necklace?

by Charity Castine
(pittsburgh, pa US)

I have this necklace I'm trying to identify exactly what it is, and whom the designer is. My mother in law had given me some of her jewelry she doesn't wear anymore, because she knows I like to make jewelry, and I use chains ands such from others some times if I need spare parts. I was about to tear apart this one but I always make sure to use magnify first to make sure there's no stamps or unusual hallmarks that may make it valuable. Something about this solitair "CH" marking made me stop, and say- hey, I'd better check into this first. But I'm having trouble finding anything remotely similar to this online... Any help would be greatly appreciated!!! Thanks!