There are no hallmarks indicating precious metals. The appearance seems to be without any problems. *This was a gift from my grandmother, and the details are unknown. Size: Approximately 5.0 * 3.8cm Thickness: Approximately 1.9cm Weight: Approximately 13.0g *Measurements are approximate. Please allow for some margin of error. *The color may vary depending on your monitor environment. I try my best to make it as accurate as possible, but it is not perfect. Please purchase only if you can accept this. *This is a used item, please judge from the images. I try to describe the item honestly, but there is a possibility of overlooking something. Please inquire in advance if you have any questions. T12480 C #Natural #Akoya #Pearl #Pearls #Jewelry #Accessories #Women's