Vintage mod style sterling silver hoop necklace. I only gave this a quickie polish. This necklace measures 4 1/2 x 4 1/2" from back to back and side to side on the interior. The circular pendant measures 1 1/4" across.
The bottom of one of the large rings on the pendant is marked 1543 AR 925. (sterling silver) The lobster claw style clasp is also marked 925.
It weighs 3.4 grams. It has some vintage wear, but it should polish up nicely.