Made with genuine 925 Sterling Silver Nickel-free and lead-free Hypoallergenic and antimicrobial Boma 925 hallmark is located on the earring post. Code: EA 9068OPN | TQN | WTPN Dimensions: approx. 1/8" depth x 1/5" width x 1/8" height About the Stones: This product is made with nano gemstones composed of an optically transparent polycrystalline material that uses a patented technology. The material is made with a base of oxides that are the same as the main composition similar to Emerald, Aquamarine, and Morganite. Boma uses nano gemstones that are lab-created and ethically-sourced. Opal symbolizes hope, creativity and protection. Its play with colors also reflects the wearer’s mood and emotions. Turquoise is associated with healing, protection, and tranquility. In many cultures it represents the connection between the earth and sky.