Oiling

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Oiling is a gemstone treatment typically used for emerald and other gems with cracks that extend to their surface. Applying oil, with a refractive index near that of the stone it's being applied to, hides the cracks in the gemstone and gives the stone the appearance of more color. Care should be taken when handling such treated gemstones as the oil can easily be removed by detergents or an organic solvent such as benzene.

Lang Antiques
Lang Antiques