Natural stone silver opal pendant size approximately: 10.8mm * 15mm * 8mm thick; Metal material: Alloy silver; An alloy silver chain is included as a bonus. The chain length is approximately 44cm, and the chain length can be adjusted. Comes with a bag, product number A4846; Opal [October Birthstone] October is the peak season for crops to ripen, and harvest festivals are held in Europe and the United States. As if to show the joy of the harvest, opal, which brings happiness to people and has the meaning of "joy, comfort, overcoming sorrow and obtaining happiness," is the October birthstone. 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!