Thank you for viewing. Size: Bead approximately 13mm Inner diameter: 16cm (elastic rubber) Pietersite is a type of amphibole, a mineral that was originally tiger's eye, which was crushed by crustal movements on the earth's surface, and later solidified again with the infiltration of quartz. Therefore, it is a mineral similar to tiger's eye and hawk's eye. It is also said that it turns blue or yellowish-brown depending on the degree of oxidation of the iron content in the minerals it contains. Especially those that are colored blue are rare, and due to their special formation process, they have a swirling pattern. This unique pattern looks like a storm, which is why it is sometimes called "Tempest Stone." The name Pietersite comes from Dr. Sid Pieters, who discovered it in Namibia, Africa in 1962. Contrary to its stormy pattern, Pietersite is said to cultivate intuition and insight, help you not lose yourself, and support you in facing adversity. Therefore, it is said to be a stone that helps you achieve difficult goals. Cancellations after purchase are not accepted. Please understand that as it is a natural stone, there may be some scratches, dents, and inclusions. 05