The necklaces are made in the Republic of China. Based on your body's metabolism, the ring color might change. That is basic chemistry. Our body needs to run on basic ph. Alcohol, coffee, soda, and some medications and drugs alter your metabolism ph to acidic. Which in the long term is not healthy. Your tarnished jewelry results from this chemical reaction with your bodily sweat and mucus. We have a solution for silver-plated ones. Please wash them with bacon soda and vinegar to clean and shine.