Black on Black Eyeglass / Sunglass Chain. Round matte Onyx beads have a single shiny streak through the middle on this interesting chain of shapes and textures, all in black. Measuring 27 inches long and made also with shiny black twisted tube beads and faceted black rondelle crystals, making black on black with black an irresistible glasses chain; with black adjustable stretch ends to fit most any frames.