Oiling is one of the most common treatments as far as emeralds are concerned. It is the infiltration of oily liquids in the small emerging cracks that can be found in this mineral in most of the cases. This adornment process, generally accepted by traders, is performed on most of the emeralds in the production places, visibly enhancing transparency and making color homogeneous. The most used liquids for this kind of treatment are natural oils, such as cedar oil or epoxy synthetic resins such as Opticon or Pernasafe. Nonetheless, as time goes by, oils oxidize and pour out of cracks. This causes the emerald to lose the original sheen. At the center of Analysis Masterstone professional emerald oiling is performed, either from a hot source or under vacuum – seal, making the choice of the most proper filler possible, to give the gem to be treated the best possible appearance.