5 CT Oval Charming Ruby Pendant, 925 Sterling silver Pendant for Daily Use - PEN4 Metal : Sterling Silver Silver tends to tarnish and become yellow and eventually black after sometimes. But it can be easily cleaned by gently rubbing the ring with colgate powder. Slight variation in shape of the stone is possible as no two natural gemstones are similar in shape and size. The photo gives a good representation of the Gemstone Ring but does not represent the actual size & color.