Blue sapphire is one of the most popular colored gemstones, distinguished by the allure of its versatile blue shades, ranging from violetish-blue and vivid blue to greenish-blue. Each blue sapphire naturally varies in color saturation, brightness, color distribution, transparency, and internal inclusions. Gemologically and mineralogically, blue sapphire belongs to the corundum species, the same as ruby, with the chemical formula Al₂O₃. The primary mechanism producing its blue color is intervalence charge transfer between iron and titanium (Fe²⁺–Ti⁴⁺) within the crystal lattice. Additional trace elements may also contribute depending on the individual chemistry of each stone.
In addition to its elegance and strong physical properties, blue sapphire features fascinating dimensions, including its geological origin, internal features, quality enhancement methods, and a long history of cultural beliefs as follows.
Read the gemstone guide
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