I was looking at the perlas site which has some information on optical qualities of a pearl.
See, to me the photo that is showing orient looks like what is being desribed as overtone on some other sites. I've always thought of that type of color as orient ( well since I first heard it described anyway) It's really very confusing to me. :-/
Oh well.
Nice pearl in the photo by the way.
http://www.perlas.com.mx/english/orient.html