Sterling Silver Black Stone Earrings, Pierced Studs, Ovals

These sterling silver black stone spinel earrings are elegant and versatile studs that feature oval-shaped black spinel stones, treated or lab-created to resemble natural gemstones.The earrings are secured with a charming butterfly fastening and are perfect for any occasion. The black spinel stones add a touch of sophistication to the sterling silver metal, making these earrings a timeless addition to any jewelry collection. I'm not sure if these earrings are vintage. They studs are stamped 925, and behind the stones are stamped NV, i believe. I'm not sure what that means, so please look at the pictures for more details. I'm really not sure what kind of stone this is. Offers are welcome and bundle to save.