Approximately 12 mm Inner diameter 17 cm ¥300 discount for purchases of 3 or more items! When requesting a combined purchase, please request with the price reduced by ¥300. Meaning, effects, purification methods, and purchase of phantom quartz | Fortune-telling Navi Natural Stone... "Phantom" in natural stones refers to crystals like quartz that temporarily stop growing and then restart, with air bubbles or other substances trapped at the boundary, creating a "mountain"-like pattern inside. It is also known in Japanese as "Gen'ei Suishou" (phantom crystal) or "Yama-iri Suishou" (mountain-containing crystal).