Vintage ATI Sterling Silver Faux Jasper Slider Pendant

Sterling silver vintage slider pendant set with faux jasper. I'm not really sure if this is a real stone with a resin coating or if this is just pure resin but I am selling this as if it's pure resin. Bale is large enough to fit most chains or cords. Pendant has some stubborn tarnish on the edges on the back side. Pendant measures 1 and 3/16ths of an inch length and 1 and 1/8th of an inch wide. Stamped ATI, 925, Mexico, and acid tests positive for sterling silver. I-12