Glass mosaic ribbed bowl fragment late 1st century B.C.-early 1st century A.D. Roman Body fragment.Translucent cobalt blue, purple, and opaque white.Slightly outsplayed neck; deep, slightly convex curving side, tapering downward.Composite mosaic pattern formed from polygonal sections of a single cane in a blue ground with a circle of white rods around a white circle surrounding a purple ground with a central white rod; on exterior, two broad vertical ribs, fairly widely spaced, with flattened tops and rounded outer edges, tapering downward.Polished interior; pitting of surface bubbles and iridescent weathering in one chip on interior; dulling and iridescent weathering on exterior and 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