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A refractometer measures the refractive index of gemstones to verify their authenticity and identity. This rapid analysis supports reliable quality control and helps to accurately assess a stone's value.
In gemology, recognizable irregularities in the stone are verified by examining it with a microscope. A stereo microscope is used here, i. H. : both eyes see the stone to be examined from a slightly different angle. This results in an almost spatial effect, so that the contamination can be localized more precisely