925 Sterling Silver
Pure silver is 99% pure silver metal. If you buy an ounce of silver in a bar then what you are getting is 99% pure silver. Unfortunately, 99% pure silver is not hard enough to be suitable for a jewelry metal. This is why we have 925 sterling silver. This is a metal that is 92.5% pure silver, so you can see where the 925 comes from. The rest is usually copper or some other alloy.