MAZUBAOYU.ONLINE Material Purity Certification S925 Silver: 92.5% silver content, internationally recognized standard. ‌ one 999 Silver: With a silver content of 99.9%, it has a soft texture and is commonly used in traditional silver jewelry. ‌ two Full Silver: Silver content ≥ 990 ‰, according to Chinese national standards, must be marked with the "Full Silver" mark. ‌ three Third party testing and certification National Gold and Silver Products Quality Supervision and Inspection Certificate: issued by the National Gold and Silver Products Quality Supervision and Inspection Center, for purity testing of non embedded gold and silver products. ‌ four China National Quality Inspection Center for Gold, Silver and Jewelry Quality Testing: Certified by CNAS and ILAC, providing legally binding testing reports. ‌ five China Gold and Silver Jewelry Quality Supervision and Inspection Station: an established quality inspection institution responsible for precious metal testing. ‌ six Imprints and Standards Imprint requirement: It must include the manufacturer's code, material, and purity (such as "S925" or "full silver"). Missing imprints may indicate non-standard products. ‌ Testing method: Scientific methods such as X-ray fluorescence spectroscopy are used to verify purity. ‌ seven Consumers can verify the authenticity of certificates through official channels to avoid purchasing unverified products.