Glass mosaic ribbed bowl fragment late 1st century B.C.-early 1st century A.D. Roman Rim fragment.Translucent deep honey brown, cobalt blue, and opaque white.Outsplayed rim with rounded lip; slightly convex curving side tapering downward.Spiral mosaic pattern formed from lengths of one or more canes in a brown ground with bands of fine blue and white threads in parallel lines; on exterior, part of a broad vertical rib, with flattened and tooling indents at sides.Polished interior; pitting and weathering of surface bubbles; dulling and creamy iridescent weathering on exterior, lip of rim, 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