I am trying to identify the hallmark on a sterling and turquoise earring. The mark is FY.
Any information you could give me on this will be greatly appreciated. Thanks!

Could be yazzie or yellowhorse. Got to southwestaffinity.com and you can get a llst of many native american silversmiths. If this doesn't work I'd suggest books at your local library that have silvermarks or hallmarks of native amerian silversmiths.