I wish to point out that I have been correct this entire thread in saying Hanadamas are the highest of the high grade. I have not been correct in every detail, but I accept and incorporate the corrections, ie the thickness for a hanadama grade.
I am correct in criticizing Yokota's use of the word for less than AAA. Even if the lab will cert lower grade pearls, it does not meet the industry standard to do so.
And anyone who questions Elisabeth Strack's definition of hanadama is blowing in the wind. She is a UNIVERSALLY accepted expert. There is no one with a broader grasp of pearls than Strack. I have found her to be off in some details, like Robert Wan having the PoA, when he only has a ceramic copy of it, but that is such a detail...... She is the Encyclopedia of Pearls and should be the final word.
Everyone's' speculations about Yokota using other grades is just plain wrong. He apparently will rank a strand within the grade as AA1, AAA5, or whatever, but that is his own sub-ranking and not mentioned by Miki or anyone else.
And he does not define it in his info pages. As a buyer, I would skip him, he costs too much and he is willing to bend the hanadama grade for profit and his info pages are full of misleading statements. When asked to check out pages for someone, we look at the info pages as well as the prices and the photos.
Here is why I do not like akoyas. A 9mm akoya can get hanadama grade with.4mm of nacre, while a 9mm Tahitian has a minimum of .8mm, whatever the grade. That is why I do not like akoyas. In the 30's akoyas often had .6 or more of nacre, but the shorter time in the oyster makes for rounder pearls for profits, not a better pearl. That is why I do not like akoyas.
Granted, they have that ball bearing luster and it is fantastic for people to buy them as they are beautiful, but these are not the pearls to wear everyday; they are the pearls that should stay in the box, except for grand occasions.
I think SS pearls also have at least .8mm of nacre. Correct me if I am wrong.
So if you want an overpriced AA handama, then buy from Yokota. I think you an do a lot better in price for the same grade, elsewhere.