Denim Blue Opal and Banded Agate Marquise Beads have a vitreous luster to chalky luster exhibit excellent faceting and show striated coloring of a champagne hue, a denim blue hue and a light blue hue creating a striking patterning. The gems are symmetrical in shape, extremely well matched, and are a variety of banded Grey Agate which forms in bands along with common blue opal.