These are real Dichroic Coated glass Rondels with the front face itself coated, not a thin piece of dichroic laminated to the back side. These real Dichroic coated treasures will catch the light differently with each facet or textured detail of the jewel. It is hard to describe the stunning effect. Each jewel will have variations of color which gives them a dynamic look, changing with light angles. The edge thickness can also vary slightly, the small ones at times slightly less than 1/8″ and the larger jumbo jewels running a little thicker at times.