According to data from Hong Kong and Taiwan, الصين: في سوق المجوهرات الدولية, the price of high-quality rubies weighing more than 10ct is more than twice that of the best diamonds or emeralds. The chemical composition of ruby and sapphire is aluminum oxide (منظمة العفو الدولية. 0,), which should be colorless when pure. But in nature, […]
