And a change in color or size of this feature may indicate an underlying disease, Linder explains. For example, if the lunula extends almost to the end of the nail, making the majority of the nail white except for a narrow band at the top, it could signal cirrhosis, chronic renal failure or congestive heart failure.

A manicure in which the moon, or lunula, is painted a contrasting color to the rest of the nail or simply left bare. The original moon manicure was worn by screen stars back in the '20s.

A fingernail moon is also called a lunula, which is Latin for little moon. The place where each nail begins growing is known as the matrix. This is where the new cells are made that will make up the nail. The lunula is part of the matrix.

Believe it or not, the half-moon design was the “first nail design ever created.” This trendy style is said to date back to the late 1920's and became the preferred style throughout most of the 30's. Yes, this manicure style is actually as old as nail polish itself!