This is unique! In many parts of the world this would be considered a hibachi but in Japan, this cooking stove is actually called a "shichirin" and a hibachi was actually just a heating device- almost never used for cooking.On this shichirin, there is a piece of beef and a shitake mushroom. Under the grill, there are some charcoal bricks.
It is on a silver tone adjustable band that will fit most ring sizes. It measures about 2.7 cm wide and 2.5 cm tall.