Shamin uses only Sterling Silver for it's line of Sterling Jewellery. The minimum silver content that we allow is 92.5, so you might see the figures 925 or 92.5 used to designate silver content. Copper is the metal most commonly used to make up the remaining 7.5 percent content of a sterling silver mix. Copper makes the silver harder, but gives it a tendency to tarnish, a darkening that occurs when sterling silver reacts with gases in the air or with other substances that it comes in contact with. However, silver that is regularly used typically needs less care, so we strongly encourage you to use or wear your silver every day.With proper care, your silver will retain its beauty and character for many generations to come.