Old Natural stone pendant with silver tone hardware, 1.5 inch, previously owned

old natural stone pendant most likey some type of agate (but not sure), with silver tone hardware, about an 1.5 inch, previously owned. Beautiful piece!! The pendant does have a mark on one side that looks like it was there before it was shined and buffed; at the top of one side it appears there may be a tiny chip. silver tone non magnetic has some light scratching. selling "as is".