Virtually all Emerald on the market has some sort of surface-reaching fractures and openings. The visibility of the inclusions is reduced by filling them. Traditionally, oils (such as cedarwood oil) are used but in time they tend to dry out thus making the inclusion more readily visible again and the gem would require another oil bath. Today, natural resin or wax type materials are preferred over the traditional oils, since the resin or wax is a natural substance with more of an almost permanent treatment life. Emerald enhancement processes date back over 600 years, and oil, natural resin, or wax type treatments are accepted trade practices that do not adversely affect the performance and durability of the gemstone, so you can expect all Emeralds will have some type of enhancement. There's no need to worry when you see these enhancements disclosed.
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