Mere oxidation. The silver could be partially copper and the acidic lime will oxidize the silver/copper piece. Pure silver takes longer but acidic oxidation will still take place.
Hello, modern men treat jewelry with restraint. All a gentleman can afford is an engagement ring, a ring, or a chain. As for the chains, one of the most popular among the guys is thick massive jewelry. Currently, thick chains adorn the necks of serious men. As a rule, such accessories are worn for show to surprise and amaze. One of them is cuban link chains.