Made with an agate slice that has been acid etched by me, tarnish resistant coated copper wire, and an 18-20 inch adjustable imitation leather necklace cord. Agates tend to have imperfections including some mild cracks. There is one on this piece and it is circled in the third picture. Sometimes the oils from our fingers get on the agate slice and it can cause the etched image to fade. No worries! Take a slightly damp cloth, wipe your piece down. When it dries it will be as good as new!