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“For example, when you look at oyster shells, they have an iridescence of pearly green and blue, and that’s definitely from minerals like copper,” she says.

But the spermaceti is full of goo resembling the pearly hue of human sperm, and possesses oily properties that once led humans to hunt them to the brink of extinction.

I’m probably seconds from pearly gates and angels.

And what is most remembered about a performance to Tchaikovsky’s “Serenade for Strings” is “the transcendent scene of 17 women onstage, swathed in the palest and pearliest of blues.”

There was a din of crickets outside, and the pauseless roar of the river, and the stately world was illumined with pearly moonlight; but inside the log it was dark and hushed, like a crypt.