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Blue Sapphire Gemstone (Neelam Ratna) Refractive Index:
The excellent gemstone blue sapphire possesses brilliant refractive index 1.76-1.78 and birefringence 0.008. Refractive index is contemplated to be one of the most significant features in order to justify the quality of the gemstone. By refractive index, we mean the speed of light traveling through a vacuum. Since, gemstones are dense in comparison with air thus; light bends or changes its direction while travelling through the gemstone. Consequently, the bending of light source while travelling through a gemstone or vacuum tube is revered Refractive index. Since, blue sapphire gemstone is double refractive index means when light enters in the stone, it rifts in two parts and travels rationally at contrasting speed at two different paths. Additionally, the difference between these two refractive indexes is recognized as birefringence which varies from 0.3 to 0.287. Thus, a blue sapphire gemstone with high refractive index is acknowledged to be a high quality gemstone.