Hard as Diamonds

“Diamonds are only lumps of coal that stuck at it no matter how much heat or pressure they faced.”
--Jeffrey Fry

Rough Diamonds

“Rough diamonds may sometimes be mistaken for worthless pebbles.”
--Thomas Browne

Roses or Diamonds

“I’d rather have roses on my table than diamonds on my neck.”
--Emma Goldman

Time Like Dimonds

“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