Sapphire is one of the most important gems. Its rarity, hardness and, above all, its silky blue color, make this gem one of the most valuable and appreciated. Its iconic blue gives it its name: "Sappheiros", which referred to the lapis lazuli. However, sapphires of almost all colors can be found, grouped in the so-called "fantasy sapphires". It has a reflection of intense, changing and magical light, from blue to purple depending on the type of light. This blue evoked an image of the sky, it was a symbol of the soul itself and of what was expected of it: fidelity, nobility and sincerity.