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Monday, 29 October 2007

refractometer (re'-frak-tom"-ehter).An optical instrument for measuring the refractive index of a gemstone. It is useful for detecting diamond sub­stitutes, with the exception of a few materials whose refractive indices, like that of diamond, are above the limits of the instrument; e.g., GGG, synthetic rutile, strontium titanate, zircon, YAG. See refractive index, re­fraction.

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