We use 9kt yellow and rose gold, sterling silver, 100% cotton Nom Nom string and African glass beads. Some items may include precious and semi-precious stones. These materials can age and tarnish naturally. Caring for your Nom Nom jewellery will help maintain its beauty and condition. We recommend regular cleaning of your Nom Nom items with warm water and non-detergent soap on a regular basis to remove oils, lotions and other daily pollutants and chemicals. Alternatively, use a jewellery and gemstone cleaner and rinse thoroughly. Follow the manufacturer’s instructions. Never use chemical cleaners on soft gemstones such as pearls.