I'm not seeing any pied markings in that picture, Pieds are born with extremely obvious and well defined patches of whites all over them.
Could be the egg came from a pen containing something like pieds or some sort of arrangement like a pied peacock with split(or not) hens.
"Emerald" was a term used to describe Spaldings(mixes of Indian and Green peafowls) higher than 3/4 Green blood. That chick kind of looks light colored.. but then my own "high blood" chicks tend to be dark or very dark colored. (The use of the term Emerald is now discouraged by United Peafowl Association, and since then it has been showing up far less often)