GIALLO jewelry is made in Mexico. General Supporting Information: Cultured Freshwater Pearls Try to avoid exposing your cultured freshwater pearls to water, makeup, creams, chemicals, and cleaning products. Freshwater cultured pearls cannot resist silver's polish. Do not use a silver polishing cloth, as it can dull your pearls. Instead, we recommend a mild soap mixed with warm water. Use your fingers to gently clean the jewelry. Do not use a brush. Pat dry and lay flat until completely dry.