This is a serpentine bracelet. - Color: Green - Material: Natural stone - Style: Bracelet - Features: Inner diameter 17cm Thank you for viewing. Serpentine silica is a natural stone formed by the mixture of serpentine and silica (silicon dioxide). It is particularly known for its green or mint blue hues and beautiful patterns with the inclusion of quartz (also known as angel silica), making it popular as a power stone. Named "serpentine" because it resembles the pattern of a snake, it is considered a stone of regeneration and protection, and is often used in bracelets and other accessories.