Yes. According to official website, Shenzhen Guojian Jewelry Co., Ltd., Shenzhen Guojian Jewelry Co., Ltd. is an authoritative inspection and appraisal institution that has been strictly examined by the national quality and technical supervision department in accordance with the national "Laboratory Qualification Accreditation Criteria" and obtained measurement certification qualification. It is the appraisal and recommendation service organization of national quality inspection stable qualified products.