These are glass rods that have been cut and fired in an electric furnace. The surface is plump and glossy... the back is flat. There are no release agent marks on the back, and it's beautifully fired. The last photo shows the back. These are cabochon-shaped, with no holes. The photos were taken in natural light near a bright window, but the color may appear slightly different depending on the conditions at the time of the photo. Also, under fluorescent lights, the color may appear darker or change depending on the type and quality of the glass. There may also be color differences depending on the electronic device you are using. Please understand this before purchasing. Glass nuggets Glass beads Glass nuggets Nuggets Nuggets Stained glass Mosaic accessories Sea glass art Glass materials Glass materials Glass crafts Moretti glass Venetian glass Reichenbach glass