If you bred a rainbow trout with an oyster, and then fed the oyster some of that rainbow-colored sand that little kids make art projects with, you wouldn't end up with anything even remotely approaching this -- This is a pearl of such surpassing beauty that one forgets its lowly nacreous origins. It seems to move of its own accord, pearlescent (and why wouldn't it be?) as it glimmers and shimmers.

Long story short: really nice pearl. Like Minnie Pearl. She was really nice, too.