This is an agate with some translucent areas. There are no hallmarks indicating precious metals. *This was a gift from my grandmother, so the details are unknown. Size: Necklace length: approx. 66cm Coin part diameter: approx. 4.4 * 2.4cm Weight: approx. 25.2g *Measurements are approximate. Please allow for some error. *The color may vary depending on your monitor environment. I try my best to get the colors as accurate as possible, but it is not perfect. Please understand this before purchasing. *This is a used item, please judge based on the images. I try to describe the item honestly, but there may be unexpected oversights. Please inquire about any unclear points beforehand. T12298 C #agate #agate #agateslice #necklace #accessories #jewelry #women's