A calligraphy set with red and black decorations. Nachiguro stone is a black, fine-grained siliceous shale (slate) that is only produced in Kamikawacho, Kumano City, Mie Prefecture (Kumano Group). It is characterized by its beautiful luster when polished. It is very famous as the black stone for Go stones, and has been used for a long time for inkstones and touchstones. In recent years, it has been used for various crafts such as zodiac ornaments, lucky charms, and garden stones. This is a used item, so there are some scratches and stains. Please check the photos for details. Thank you for viewing.