Glass mosaic ribbed bowl fragment late 1st century B.C.-early 1st century A.D. Roman Body fragment.Translucent honey brown, cobalt blue, and opaque white.Convex curving side tapering downward.Ribbon mosaic pattern formed from sections of a single cane in brown ground with irregular wavy white and blue threads in parallel lines; on exterior, three vertical ribs, fairly widely spaced, with flattened tops, expanding downward.Polished exterior; pitting of surface bubbles on exterior; creamy iridescent weathering on interior; iridescence on jagged edges.. Glass mosaic ribbed bowl fragment. Roman. late 1st century B.C.-early 1st century A.D.. Glass; cast and tooled. Early Imperial. Glass