Glass mosaic ribbed bowl fragment late 1st century B.C.-early 1st century A.D. Roman Translucent purple, cobalt blue, and light turquoise blue, opaque white, and colorless.Outsplayed, rounded rim; convex curving side.Mosaic pattern formed from large polygonal sections of two or more canes; one in a purple ground with a circle of white rods around a central pattern of small squares in turquoise blue outlined in white, and the other in a blue ground with a circle of white rods around a central square in purple with white dots, and irregular patches in colorless with white rods; on exterior, two widely spaced, vertical ribs, with flattened tops.Polished interior; pitting of surface bubbles on interior; dulling and creamy iridescent weathering on exterior, rim, and jagged edges.Part of the rim and side of a deep, footed ribbed bowl with broad flaring rim.. Glass mosaic ribbed bowl fragment. Roman. late 1st century B.C.-early 1st century A.D.. Glass; cast and tooled. Early Imperial. Glass