Metals and alloys

What metals are used to make jewelry?
What does gold purity "585" mean?
Why does silver darken?
Russian gold - what is it?
Why does a gold ring leave a dark mark on the skin?
Good afternoon, I would like to know. Do you accept gold, torn gold chains, ring bracelets, all Russian gold and at what price? Thank you very much
Russian gold - what is it?
Russian gold 585 - what is it?
Red gold - what is it?
Red gold - what is it?
Russian gold value - how much is it?
Do you sell silver in blanks?
I want to sell personal gold items....