Water-filled glass necklace, large Comes with an adjustable leather cord. This is a handmade piece created using electroforming, a copper plating technique. Please be cautious, such as avoiding prolonged wear, if you have sensitive skin. The color will gradually change over time, developing a rich patina. Sudden color changes may occur due to hot springs or sweat. We recommend wiping off sweat with the included cloth or a soft cloth after wearing and storing the necklace.