Learn the science and trade secrets of the world’s most valuable coloured gemstones—Ruby, Sapphire, and Emerald—with this professional online gemology course. Designed for beginners and industry professionals, the program covers gemstone identification, treatments, grading, and pricing techniques used in real jewellery markets. Build practical skills and gain in-depth knowledge to confidently evaluate gemstones and grow your career in the gems and jewellery industry.