Glass mosaic ribbed bowl fragment late 1st century B.C.-early 1st century A.D. Roman Rim fragment.Translucent cobalt blue, opaque white and yellow.Outsplayed, rounded rim; concave curving neck, almost straight side.Composite mosaic pattern formed from polygonal sections of two or more canes: one in a blue ground with a circle of white rods around a central, tight yellow spiral; a second in a blue ground with a central white rod surrounded by a circle of yellow dots; on exterior, top of a single vertical rib, squared off above, and irregular horizontal tooling marks around neck.Interior polished, with pitting of surface bubbles; dulling, pitting, and slight creamy weathering on rim, exterior, and upper part of 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