we then mixed additional epoxy and hardener and used it to all surface cavities of various shapes and sizes on both natural and sintetic emeraldsafter a minimum of 24 hours the excess cured epoxy was polished down to the level o te stones surface te filled cavities can be readily identified with magnification and darkfield or surface-reflected illumination in addition they may-be only partially filled as is the case with rubies and sapphhires however such fillers generally are not as durable as the host gem if the cavities are large the filler could add to the weight of the stone