Imperial Glass Company Amethyst Carnival Glass 5" Diamond Lace Berry Bowl. Saw tooth edge on a collar base berry bowl, this amethyst carnival glass piece is in very good condition. The irridescence has rich, vibrant hues of greens and gold. The Imperial Carnival glass bowl does not bear a manufacturer stamp. Diamond Lace appeared in the catalog released by Imperial Glass for 1909 production. The pattern is available in limited piece and colors. 5" w x 2 1/2" h