It takes a lot of homework to buy or sell. This advice might make it hard to know where to start.
Use a polishing cloth on your jewelry pieces. This will allow your jewelry stays shiny without having to use any chemical cleansers or solvents. Use the dual-sided cloth on your jewelry just as though you would clean a glass. Use one side to shine it and the other for improving its shine.
Know which kind of stone you make a jewelry purchase. The three types are imitation, imitation and natural. Natural stones and synthetic gems are both real, whereas imitation is just an item of plastic with gemstone colors. Natural stones are dug up out of the ground and synthetic gems are grown in a lab.