PROFESSIONAL GEMSTONE IDENTIFICATION TOOL – This Chelsea filter helps jewelers and collectors quickly identify gemstones by observing color reactions in red, blue, and green stones. Use it to inspect emerald, jadeite, ruby, and other gem stones with a compact, easy-carry design. DETECTS NATURAL VS SYNTHETIC STONES – Designed for gemstone testing, this tool helps determine whether a stone is natural or synthetic by revealing subtle color shifts. Ideal for jewelers using refractometer methods, loupes, and magnifiers during stone identification. RELIABLE FOR SPINEL & DYE DETECTION – A trusted filter for detecting Synthetic Blue Spinel and spotting dyes in certain gemstones. Its accuracy makes it a valuable companion to a dichroscope, gem loupe, magnifying glass, or professional magnifier kit. EASY TO USE FOR FAST GEM CHECKING – This is a must have proffesional tool in gemology testing. We recommend read a book, take a class or consult with a gemlogist of how to identify gemstones. Simply shine light on the gemstone, view through the Chelsea filter, and watch for color changes that reveal composition clues. This quick, handheld method works well alongside a folding loupe, hand lens, or jeweler’s tools. COMPACT & TRAVEL-FRIENDLY FOR JEWELERS – The folding design protects the lens and fits neatly into a pocket, making it perfect for jeweler travel kits, coin inspection, or gemstone shows. Ideal for gem stones testing, jewellery hobbyists, and professional jewelers. The ADE Advanced Optics Chelsea Filter is a trusted gemstone identification tool used by jewelers, collectors, and hobbyists to evaluate gem stones quickly and accurately. This compact folding filter helps identify red, blue, and green gemstones such as emerald, jadeite, ruby, and Synthetic Blue Spinel by displaying unique color reactions. It also assists in detecting dyes and determining whether a gemstone is natural or synthetic, making it a valuable partner to a refractometer, dichroscope, jeweler’s loupe, magnifying glass, or hand lens. Easy to use, you simply shine light on the stone and view through the filter to observe changes that aid stone identification. Lightweight, durable, and travel-friendly, it fits perfectly into any jewellery kit and supports gemstone testers who want a reliable, professional-grade tool for everyday evaluation.