With more than 20 years of experience and a chemical laboratory dedicated to it, GGTL Laboratories Switzerland offers a specialized service in the cleaning and oiling of emeralds, unique in Europe. Whether the stones have been filled with oil or epoxy resin, our experts clean and re-oil, if desired. If your aim is to obtain a no clarity enhancement grade, we can help you as we also propose a deep cleaning that removes any quantifiable trace of filler.


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