This is a 10.3mm size bracelet. These are beads made by polishing rocks formed from lava that flowed out during the eruption of Mount Fuji. The last large-scale lava flow eruption of Mount Fuji was the Hoei eruption in 1707, and there have been no such eruptions since then. In other words, the original stone that these beads are made from can be traced back at least 320 years, but lava flows were also recorded in 1435 and 1033, so please consider that lava stones from multiple eras are scattered in parallel (precise dating requires academic analysis). If you were to use a mineral name for this lava, it would be related to obsidian, but Fuji lava is mainly basaltic, characterized by porous black rocks. In other words, this suggests that Mount Fuji's eruptions are not the type that flow smoothly and gently like the eruptions of Miyakejima (eruptions that tend to produce obsidian), but rather closer to Unzen Fugendake (although not a devastating eruption), with volcanic bombs and other features, indicating volcanic activity with viscous lava that comes flying out. That is why the next eruption of Mount Fuji, which has been silent for over 300 years, is feared, but conversely, this bracelet is made from beads processed from rocks created with such a powerful force of the earth. They used to be available in the past, but they have become rare in recent years, so please consider them as one of the domestic stones and as an element that forms a World Heritage site (^o^) (Number of beads) 20 (Bead size) Approximately 10~10.3mm Due to the characteristics of the original stone, there are many holes and gouged-out parts. Please be aware of this before purchasing. (Wrist size) 17cm (This size can be worn by a typical man) (Shipping method) Will be sent via Mercari delivery. It will be packed with air cell mat and shipped quickly. If you have any questions, please leave a comment and I will answer, but I will reply late at night on weekdays due to work. Thank you for your understanding. ・Natural stone ・Bracelet #MorinoIshiyaSanLavastone ← By stone #MorinoIshiyaSanBreath ← By item #MorinoIshiyaSanBlack ← By color #MorinoIshiyaSan ← All products