Galaxies

"Beneath the thickness of the bottom of his beard, nestled against his dark-blue tie, is a stunning pendant. Outlined in smooth silver, the center contained a fairly large stone. Different bright colors seemed to be swirling in it; red green and blue. Embellished with tiny flecks of white, it was almost illuminated.

"Oh...that is beautiful." she marvels, still staring at the gem, her blue eyes reflecting its twinkling showcase of light as she lowers her face down to get a closer look.

As she gawks at it, its serenade of colors comes streaming out towards her in a seemingly endless parade of stars, moons, planets and nebulae, almost as if she were standing in a vast space, the marketplace and its crowd dissipating amid the brilliant light show."-Reverie

Human Maturin, like book Maturin, would have visible galaxies swirling around within his nails if you look closely.