Thank you for viewing! ^_^ Inner diameter: 16cm Size: 9mm+ This is a natural stone, agate (めのう), filled with crystal formations inside, and its opening looks like a smiling mouth. It's popular as a charm for good luck, improved fortune, and warding off evil spirits, and it's believed that good energy gathers in the cavity, also known as a "dragon's cave." Good luck/Financial luck: It is said to enhance financial fortune and bring good luck. Evil warding/Protection from evil: Agate is known as a powerful ward against evil spirits and has an amulet effect. Relationships: The stone's words for agate include "harmony and coexistence," and it is also said to smooth relationships. Mind-body balance: It is also said to have a healing effect that relieves stress and anxiety and balances the mind and body.