这古柏林说的Treatments in emeralds - Enhancing the clarity by filling fissures with a transparent substance such as oil or resin is the standard treatment applied on emeralds. Gem labs determine the presence and the extent of such a clarity enhancement, as it can dramatically affect the appearance of a stone. This image shows an emerald with clarity enhancement before (top) and after (bottom) clarity enhancement. Note that such fissure filling can be removed, making the clarity enhancement in emerald a reversible and repeatable process.

另外对于js来说一次也够了。