Vintage Green Onyx carved Mexican earrings & necklace 925

Vintage Green Onyx carved Mexican earrings & necklace 925 no markings on the pendant the earrings have a markes mark? and 925: i am not sure either piece is sterling. Very noce piece of Mexico histry soon these pieces will be gone forever. 💗 earrings are appx 1” screw back pendabt is 1.5” with a 20” silver tone chain J2023-112