💎 Discover the Hidden Beauty of Gems!
The Hodgkinson Method of Gem ID is a comprehensive 4-card set designed to empower gem enthusiasts with the ability to approximate a gem's refractive index, birefringence, and dispersion using visual techniques. Featuring clear instructions and excellent diagrams, this set is perfect for both beginners and seasoned gemologists looking to enhance their skills.
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منذ شهر
منذ شهر
