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Refractive index, or RI is one of the most important signatures of a gemstone. Measuring the refractive index is one of the first steps in identifying a gemstone, though some gems have similar refractive indices and additional tests are required for a definitive identification.
For gemologists, refractive index and double refraction (birefringence) serve as important clues for identifying gems. The following table lists these values for a variety of stones found in jewelry and gem collections. Rubies and spinels may show similar colors.
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Refractive index, or RI, is the measurement of the bending of light when it passes from air to another material. If light passes from air into a transparent material at one angle, it is deflected at a different angle (the coincident angle).
24 lip 2024 · Simply enter the diamond’s 4Cs – Carat, Cut, Clarity, and Color – and get an instant valuation. Trusted by our experts, our calculator shows the diamond pricing for everyone. Carat measures a diamond’s weight, with one carat equaling 0.2 grams.
Most gemstones have 2 refractive indices, since light is split into 2 beams travelling at different speeds when it enters the gem. This phenomenon is known as birefringence or double refraction, and it is expressed as a value that indicates the difference between the two RI's for the gem material.
