Need Help identifyting Hallmark and value on a Necklace

I inherited this necklace from my mother when she passed a year ago, the Hallmark can be seen on the left side clasp, which is stamped GERONIMO with a capital G with an arrow going through it from the right to the left. I will see if I can get a better close up of it in a couple of days.

Curious if anyone has any information on the history and/or value of the piece

Close up of the hallmark


Sorry I can’t help with identifying the maker, but the necklace is beautiful. Are you trying to sell it? If so, please contact me. Thank you.