The questions are diamonds you hold in the light. Study a lifetime and you see different colors from the same jewel. The same questions, asked again, bring you just the answers you need just the minute you need them. – Richard Bach, Running From Safety

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

Guard well your spare moments. They are like uncut diamonds. Discard them and their value will never be known. Improve them and they will become the brightest gems in a useful life. – Ralph Waldo Emerson

[T]he diamond and other precious stones are focuses of light, and essences of colour which seem expressly created to ornament on a small scale the human body with all the splendours which adorn the universe on a large scale. – Charles Blanc, Art in Ornament and Dress, 1875