Material: Hypersthene 12x12mm, Silver925 Origin: USA Size: Approximately 12x12mm Weight: Approximately 3g Features/Meaning: This is a chic and cool fashion ring with a black color and a metallic sheen. The metal part is Silver925, so those with metal allergies can wear it with peace of mind. Hypersthene is also known as "Shiso-kiseki" (Perilla-like Feldspar) in Japanese. It is a type of pyroxene, and those containing a lot of iron are called ferrosilite, and those containing a lot of magnesium are called enstatite. Hypersthene is the intermediate mineral. It is also called hyperscene. It is a beautiful natural stone with a white to pink sheen (optical effect) floating in the black stone. Product Number: PRG2017