Feature Gems & Gemology, Summer 1990, Vol. 26, No. 2

Diamond Grit-Impregnated Tweezers: A Potentially Destructive Gemological Tool

John I. Koivula, Edward Boehm, 和 Robert C. Kammerling

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The authors examined diamond grit-impregnated tweezers that reportedly were being marketed out of Japan. The tweezers were shown to damage virtually any type of gemstone with the possible exception of diamond; owners of these tweezers are advised to use caution.