Ryukyu Glass - Drinking Glass Okinawa Ishigaki Island - Glass Island Unused (with box) Size: Diameter: Approximately 8cm, Height: Approximately 8cm Slight variations may occur. The fine bubbles and the warm color gradation are very beautiful, and it is a thick and sturdy item. Each piece is handmade, and there are no two that have exactly the same shape or color. I received this as a gift from an acquaintance several years ago and have kept it at home.