1, the silver content is different: the silver content of 990 silver ornaments is not less than 99.0%; The weight content of silver in 999 silver jewelry is not less than 99.9%, and the highest can reach 99.95%, so the purity of 999 bracelet is better than that of 990 bracelet.

2. Different hardness: 990 has low silver content and high hardness, and can be easily used to make bracelets or handicrafts; 999 is not suitable for making imitation platinum or K-gold inlaid ornaments because of its high silver content and low hardness.

3. Different brightness: The higher the purity, the easier it is to oxidize and turn black. In terms of material purity, 999 hands are better than 990 bracelets, so 999 hands are better than 990 bracelets.

Extended data:

Maintenance methods of silver ornaments:

1, worn every day, human body oil can produce natural and moist luster.

2, keep dry, don't close to hot springs and seawater.

3. When the silver jewelry turns yellow, you can gently rinse the surface with toothpaste and some water. Or use a small jewelry brush to clean the fine seams of silver jewelry, and then gently wipe its surface with a silver cloth.

4. Silver is soft, so you should avoid squeezing and pulling when wearing it.

Baidu encyclopedia-sterling silver jewelry