According to the information I have learned, the steel seal of YHs990 represents thousands of feet Silver, that is, silver ornaments with a silver content of 99%. This kind of silver jewelry is usually of high purity, looks white and shiny, and its surface is uniform, bright and polished. In addition, the density of silver is slightly higher than that of ordinary metal, so if the bracelet is large in size but light in weight, it may be made of other metals instead of pure silver.

In order to further confirm the composition of the bracelet, hardness test can be carried out. The hardness of silver is lower than that of copper but higher than that of lead and tin. You can use a pin to scratch the bracelet in an inconspicuous place to test it. If there is a trace but it is not obvious, then the bracelet may be made of silver.

Hit the floor, a piece of sterling silver jewelry, no elasticity, issued a "bam" sound. If the bracelet has a high and sharp voice and a short rhyme, it may be made of copper, lead or tin.

I suggest taking the bracelet to a professional jewelry store or jewelry store for testing, so as to determine the composition of the bracelet more accurately.