given the price you pay for fine jewelry, it should last forever. this is why we always use precious metals such as solid gold and silver to fabricate our jewelry, and never plated or base metals such as brass or nickel silver.
wouldn't you like to know if your gemstone has been irradiated or dyed? you should know what kind of treatments your gemstones have been through. this is why we always disclose this information, and prefer to use non-treated gemstones when creating our jewelry.