HULASI's Baby's (Kids) Bracelet/ Bangle Kada is of 92.5 Original Pure (Chandi) Sterling Silver with Black Nazariya Beads/Crystals which have a Long lasting sparkle. Usec mainly as nazariya to keep babies away from evil eye; Soft edges do not hurt | Size: 4.5+ Extension (For Infant to 3 years Baby). One's -Babies (Boy or Girl) . Excellent Gift for Birthday , Naming Ceremony and Festivals celebrations Why does 925 Sterling Silver jewelry get dark? ??? It is a natural reaction for your jewelry to tarnish over time. The blackened color of this metal indicates, precisely, that our jewelry is made of 925 Sterling Silver. 925 Sterling Silver darkens due to daily use, as well as for other reasons. One of the most common reasons is the use of products such as perfumes, shampoos or gels. It may also react immediately with corrosive or cleaning products. In addition, this metal can also become contaminated by reacting with small particles in the air, such as sulphur found in the atmosphere in the form of sulphide or hydrogen sulphide. And as an intersting fact! Silver is not darkened by "oxidation" (since it is a noble metal and cannot be oxidized), but it acquires that color by "sulfidation". Another factor to consider is the PH of our skin. If it tends to be acidic, there is more chance that the silver will turn black. That explains why your jewelry can tarnish faster than the jewelry of other people. It depends on the acidity of your skin.