This set of four art pottery coasters are made of earthenware clay and they measure 4" round by 1/2" thick. They have a beautifully carved decoration of an Iris blossom in full bloom. They are glazed in a thick organic glaze in a combination of orange and oyster colors with orange Iris blossoms, green leafy accents and piped in black mat accents lines in the carving. The glaze is high-fired, thick and made for its purpose. These coasters are covered in felt, so if they are marked we cannot see it. Given their glaze treatment, we believe these are likely a small studio in the US. We estimate these to be mid-century, given their design and color set. This set is in original studio condition, no apologies and virtually no noted wear.