I have no idea what hanadama pearls are, but that set is beautiful. You really got a lot of bang for your buck.
Check this out TaliLady it might help:
Hanadama Akoya Pearls
Hanadama Akoya Pearls Defined Hanadama is a Japanese word for "Spherical Flower" and is the term used to describe the highest quality and most highly valued akoya pearls from any given harvest. These pearls are separated from typical class grading prior to auction and are sold as individually...www.pearl-guide.com
Here are some hanadama pearls for your viewing pleasure, TaliLady:
Hanadama pearls - Pearl Paradise
I would like to see some in person, someday, especially the naturally white ones.