Sterling Silver Yin Yang Earrings Made in Mexico

Lovely Sterling silver earrings for pierced ears, made in the land of the silver experts: Mexico! I'm not sure what the black part of the earrings are, but suspect that it is onyx. Beautifully crafted. Measure about 17 mm across. Some patina (let me know if you want it polished before sending - I like my silver with patina :-) ). Very good pre-owned condition with signs of wear that do not distract from the beauty. Earring backs are not original, but instead silicon backs. Marked "Mexico 925"