Our bracelets are made using premium quality stones. They are also water proof but be extra cautious when wearing our bracelets while exercising, sweating, going to the sauna as this may discolour or scratch them, which we are not liable. Please do take care of our bracelets and treat it as any other jewellery that you may own. Our bracelets are using double strings to enhance the strength. We follow the measurements given by the sizing closely +- 0.1-0.3cm.