Why silver jewelry is not 100% pure silver

100% pure silver is considered not nice to be used. There are some reasons explaining why pure silver is not 100% pure silver.
The soft texture of pure silver makes it easier for it to be scratched. The worst condition is that the jewelry is damaged fully. Even you are the most careful person in the world, everyday wearing leads to shape of the item. Thus, it is not durable metal, though having an attractive look.
As a result, copper is mixed with silver to create a more hard and utility alloy without any decrease on beauty. Generally speaking, 92.5 percent silver and 7.5 percent copper form the most popular metal material now, which is called “925 silver”.
Pure silver is very prone to tarnish.
The frequent rust and stains on silver take the shine off the jewelry. All the people hope their jewelry is easy to take care and keep glittery all the time. “925 silver” is much easier to be cleaned, solving the fade problem of pure silver.
In addition, jewelry makers study on various polishing ways and add a lot of labor and techniques into the present crafts. The quality of silver is improved day by day. 
As is stated above, the majority of jewelries in the market from necklaces to bracelets are made of “925 silver”. It is a better alloy for jewelry absolutely.