At Timmersgems you will find the best quality pearls from Japan, China and other areas, always harvested and produced in an eco-friendly way, with a heart for nature and people. Cultured freshwater pearls are pearls that are cultured and made using freshwater mussels. These pearls are produced in Japan and the United States on a limited scale, but are now almost exclusively produced in China. The United States Federal Trade Commission requires cultured freshwater pearls to be referred to as "freshwater cultured pearls" in the trade. quality cultured freshwater pearls is evaluated through a rating system of a range of values based on luster, shape and other factors Pearls collected in the wild from the Holarctic freshwater pearls mussel were important sources of pearls for medieval jewellery, with Scotland being an important source , this species is now endangered in most areas.