can you identify the maker of this huge ab rhinestone and sterling pendant?

by leda
(texas)

I have a huge, 2 1/2" by 1 1/4" by 1/4" front to back Sterling Silver pendant hallmarked or maker signed O.S. within a square.

Covered in large AB rhinestones with yellow gold, rose gold, and white gold beading. The tiny central setting is a seed pearl.

The pendant has an celtic or aztec like design.
Stamped .925. Can you identify the maker?