Superior-quality, natural yellow sapphires are very unusual, so jewelers may possibly make up the primary difference by using treatment plans or synthetic stones. Heat and irradiation treatment plans are frequent to improve coloring, but irradiated gems can fade from daylight exposure. Diffusion is another much less common treatment. At Angara, https://thebookmarklist.com/story17918451/not-known-factual-statements-about-natural-yellow-sapphire-from-sri-lanka