"Discover how the Chelsea filter can help gemologists unlock the subtle secrets within gemstones. From the faint red reaction of natural lapis lazuli to the hints of chromium in jadeite, learn how to use this tool to distinguish genuine stones from synthetics and imitations. With insights on combining tools like a dichroscope and a 10x loupe, this guide will sharpen your skills to identify over 85% of gemstones confidently. Trust your eyes and perfect your gemology expertise!" Credits: Content by Blossom Lab of Gems Institute Disclaimer: "This video is intended for educational purposes only. The information provided is based on gemological techniques and may require additional practice and training. Please consult a certified gemologist for gemstone identification and authentication. The accuracy of Chelsea filter reactions may vary based on gemstone characteristics and external conditions."