These are 100% natural raw birthstone nuggets in their most organic state. They all come in different shapes, shades and sizes. Each stone average between 9mm-12mm with electroplating. Makes a great minimalist look and is perfect for layering with other necklaces in your collection. All metal components are gold plated over brass. Chain is 16” + 2” extension. Your jewelry will arrive in our custom box ready for gifting.