| 摘要 |
An apparatus for measuring the color of a brilliant-cut diamond, comprising a light source for providing a measuring light, a holder for holding the diamond to allow the measuring light to enter the diamond through a table facet thereof, a photodetector for detecting a light which has emerged from the diamond through its table facet, a measurement unit for measuring a spectrum of the detected light and an arithmetic unit for deriving tristimulus values from the spectrum. The apparatus is of great practical advantage in that it can objectively measure the colors of brilliant-cut diamonds, and can produce measured outputs which can easily be converted to color grades of the type which has widely been used conventionally.
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