I agree with Ashley. The designation for one of those would be "gem". Unfortunately, lots of buyers, and merchants too, have never seen gem quality, let alone carry any. That is one of the things that really, really irks me---merchants that throw the "gem" word around like it was really so. Some of the worst offenders are retailers of Kasumiga pearls. It seems that any lumpy-bumpy, yellowy tinged, lopsided, cloudy conchiolin patched, and missing pieces of nacred(you can see the layer underneath)specimens are automatically passed of as "gem" just because they are rare. These are not "gem". They are what they are, which is a lower quality of a rare pearl, is all. Gem quality in stones means it is as close to perfection in all desired aspects as naturally possible. Of course, you will have to pay a pretty penny for gem quality.

Slraep