People typically have a half-moon shape, or lunula, ... Skin color and other factors may make the lunulae more or less visible. ... which is a type of poisoning caused by excess silver exposure.

For anyone who's not familiar, half-moon nails feature a half circle at the nail bed that's either a different color from the base nail-polish color or clear. "The half-moon nail-art trend ...

What’s the half-moon shape on my fingernails ... Healthy lunulae are usually a whitish color and take up a small portion of the bottom of your nail. They’re usually most visible on your ...