Surface Coating


    On a diamond, colored gemstone, or pearl, the application of a thin artificial layer on the stone’s exterior to impact appearance. Coatings are, typically, not considered permanent; their effects may diminish over time.

    On a diamond, chemical coatings can disguise less desirable interior hues. On a colored gemstone, coatings can improve color and overall appearance. And on a pearl, coatings can create the illusion of a smoother surface and/or enhanced luster. On an EGL USA report for any stone type, coatings are clearly noted. In addition, EGL USA does not provide color or clarity grades for coated diamonds.


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