Metal: Silver Plated on Recycled Sterling SilverGemstone: Sapphire Blue Nano-crystalBand Width: 3.9mmStone Dimensions: 2.5mmWeight: 3.9g What are Nano-crystals?Nano-crystals are innovative, lab-created stones that are designed to mimic the look of natural gemstones, without the impact of mining. Product Code: GU-S-R8-BCZ