Quantum Quatro Silica is a power stone composed of a mixture of minerals, primarily chrysocolla, smoky quartz, shattuckite, and malachite. With a blend of blue and green hues, each bead is unique, resembling the Earth or a painting, and is visually stunning and soothing. Its beauty is said to enhance its healing power, providing the wearer with a sense of tranquility and lasting comfort. Inner diameter: 17cm Bead size: Approximately 10.5mm to 10.9mm 19-111