Hi Slraep,
I sent you a PM but then thought others might be interested in my own side by side comparision experience.
I have an 18" freshadama strand that I bought from Jeremy. (I had arranged a private sale prior to them being made available on the web.) I wore it and went to a jeweler where I knew they carried a reasonably good selection of what is considered upper end strands. They happened to have a strand in with hanadama certification that they had special ordered for a client who ended up not purchasing it. I tried it on, next to my freshadamas. My husband was with me and, from 5 feet away, he couldn't tell the difference, and he has a good eye for details. Looking at myself in a mirror, from a distance, I could hardly tell the difference, and I have a very good eye for details. (Mostly I noticed the slight difference in size and overtone between the two.) Right up close, side by side, the hanadama strand had a harder, more metallic shine to it. (Mirror, I think, and Zeide would probably say that comes from the extra processing the akoya go through.) The only other way to tell the strands apart was by that slight difference in overtone and by the clasps.