Men's Blue Chalcedony Sanman Jodo with Silver Ring Jodo SectLimited edition. Chalcedony that retains the texture of the original stone. Chalcedony is a natural stone with the same components as quartz, and opaque to translucent stones are collectively called chalcedony. It is generally known for its pale and gentle blue color. The chalcedony we have prepared this time is not only gentle blue, but also processed into a round ball from the original stone, so the beige colored part of the original stone remains.