The highest grade silver necklace is normally constructed of 925 sterling silver, which comprises 92.5% pure silver and 7.5% additional metals (most commonly copper) for durability. Look for pieces that are hallmarked with 925. High-quality silver necklaces may have a polished, matte or textured surface, depending on the design. But they should always have a secure clasp, and may also be rhodium-plated to prevent tarnish. Trusted jewellers or brands that offer confirmed authenticity ensure you're getting high-quality silver with long-lasting beauty and value.