Many individuals have, like uncut diamonds, shining qualities beneath a rough exterior. – Juvenal

The rarest things in the world, next to a spirit of discernment, are diamonds and pearls. – Jean de la Bruyere, translated from French

Now the melancholy God protect thee, and the tailor make thy garments of changeable taffeta, for thy mind is opal. – William Shakespeare, The Twelfth Night

Do not judge from mere appearances; for the lift laughter that bubbles on the lip often mantles over the depths of sadness, and the serious look may be the sober veil that covers a divine peace and joy. The bosom can ache beneath diamond brooches; and many a blithe heart dances under coarse wool. – Edwin Hubbel Chapin