Five Monochromatic Color Filter Set For Fiber Optic Light

The -Filters have multiple uses in Gemstone Identification. The monocromatic -yellow filter can be used with your refractometer. The blue filter aids in the identification- of treatments in stones as does the red, blue and green (you choose the color based on the body color of the stone.) I find that the blue filter really makes the -GLASS stand out (by turning the glass black) in Glass- filled Rubies!!

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