If you have a desired inner circumference, please be sure to let us 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 8mm & 10mm Mixed crack crystal 8mm Rondel *The number of stones will vary depending on the size. 【Crystal】 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. It can absorb and purify negative energy for not only power stones but everything, bringing it to a pure state. Placing crystals as interior decoration in a room will also purify the space. It is especially effective when placed in areas with high traffic, such as the entrance. Of course, it also has healing power for the mind and body. It affects the mental aspect, but especially affects the human immune system, repelling negative energy from the outside and maintaining a healthy state. In addition, it has the function of activating vitality, so you can obtain vibrant health and beauty. *Because they are natural stones, the color and pattern may differ even for the same stone. *Colors may differ from the actual product due to lighting conditions. In addition, natural materials may have cracks and inclusions. Please understand this beforehand.