The Swiss Gemological Institute (SSEF) has been receiving large quantities of saltwater pearls for certification. Upon testing with advanced technology, they have found that many of these pearls claiming to be natural are actually beadless cultured pearls from pearl farms. Some individuals are selecting cultured pearls that look natural and introducing them into the natural pearl market. SSEF has adapted their definitions of natural and cultured pearls to address this issue, and protects the natural pearl trade by clearly identifying necklaces of matching cultured pearls.