lapis lazuli vs midnight blue

lapis lazuli

adj

Of a deep, bright blue, like that of the stone.

noun

A deep-blue stone, used in making jewelry, and traditionally used to make the pigment ultramarine.
A deep, bright blue, like that of the stone.

midnight blue

adj

of a dark blue colour, almost black.

noun

a dark blue colour, almost black.

How often have the words lapis lazuli and midnight blue occurred in a corpus of books? (source: Google Ngram Viewer )