How to tell the authenticity of silver ornaments? What does it mean that a silver ring hits a silver thousands of feet?

..... Those two upstairs are here to tell jokes, right? First of all, can you tell the difference between silver ornaments? Don't confuse silver ornaments with silver dollars, it's not a concept ~ ... Second, you can believe that thousands of feet Silver has become a stunt. Is this the so-called ignorance? Oh, my God, "Can I renovate if the color is not bright?" Do you recommend silver jewelry? If the silver becomes darker, it can be washed back directly. If the color gets darker, it needs to be renovated. I really don't know what this material is ... finally, let me explain to you that 925 refers to 92.5% silver content, and the rest is alloy and mercury, which belongs to industrial silver and is harmful to human body ... Don't believe that adding alloy can increase brightness and hardness, which is the reason to save costs. ...