Frank J. Wilstach, comp. A Dictionary of Similes. 1916.
Limpid
Limpid as a cold blue lake on a mountain.
—Anonymous
Limpid as a diamond.
—Gabriel D’Annunzio
Limpid as the eye of a heron.
—Osmanli Proverb
Limpid as the mountain stream.
—John Skelton