This is a Ryukyu glass, a traditional craft of Okinawa. Ryukyu glass is characterized by its vivid colors that reflect the nature of Okinawa and its warm texture. The basic colors of Ryukyu glass include orange, brown, green, light blue, blue, and purple. The orange color is said to represent the beautiful "morning and evening" of Okinawa. This Ryukyu glass features a beautiful red gradation, and its wavy design is easy to hold and visually pleasing. Bumpy Glass Okinawa Ryukyu This item has been stored in a glass cabinet since purchase.