Natural stone silver opal pendant size approximately: 9mm * 13.5mm * 4mm thick; Metal material: alloy silver; Comes with a bag, product number A3925; An alloy s925 silver chain is included as a bonus. The chain length is approximately 48cm, and the chain length can be adjusted. Opal [October Birthstone] October is the peak of the harvest season, and harvest festivals are held in Europe and America. As if to show the joy of the harvest, opal, which brings happiness to people and has the meaning of "joy, comfort, and overcoming sorrow to gain happiness," is the birthstone of October. Opal is a lucky charm. [About Opal Rings] Opal is characterized by its beautiful iridescent spots. The secret lies in the "play-of-color" effect, where the refraction of light changes depending on the size of the particles, generating different colors, creating the unique and beautiful colors of opal. With an elegant design, it's perfect for girls' gatherings and dates. ■The color of the photo may look slightly different from the actual product depending on the shooting environment. Instant purchase OK. Thank you!