It is gold plated over brass. It is sold individually. It does not require a hole and can be adjusted according to the ear. You can use it for a long time as long as it is kept away from chemicals such as perfume, soap, disinfectant etc. It does not darken in contact with water. OUR RECOMMENDATION AS PİNERY JEWELS: Keep your product in its original packaging or in a soft pouch to prevent scratching. You can wipe it with a soft cloth to maintain its original shine. Remove your product before washing your hands, before swimming, and before using body care products such as perfume, hair spray, soap or lotions. These processes can damage the metal - shorten the life of the coating and cause discoloration and loss of shine in the stone. Avoid hard impacts as they may cause scratches, cracks and other damage.