If you have a desired inner circumference, please be sure to let me know before purchasing. It will be an additional 50 yen for every 1 cm increase. Reducing the size is free. Inner circumference: Approximately 17 cm (stretches) Crystal 10mm Turquoise 8mm Metal rondelles Crystal is a versatile stone. It is the basic of all power stones. As you can see from its use in purifying power stones, it has a very strong purifying effect. Not only for power stones, but it can absorb and purify negative energy for everything, bringing it to a pure state. Turquoise is a power stone filled with bright and vibrant energy, like the color reminiscent of the clear, vast sky. It repels negative energy and wipes away pent-up emotions. Like water seeping into dry earth, it provides stability and moisture to the heart. *Because they are natural stones, the colors and patterns may vary even in the same stone. *Colors may differ from the actual product due to lighting conditions. Also, natural materials may have cracks and inclusions. Please understand this beforehand.