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You can find a diamond in the rough a lot of times.

Let us not be too particular; it is better to have old secondhand diamonds than none at all.

Diamonds have an image of purity and light. They are given as a pledge of love and worn as a symbol of commitment.

On a submicro scale, pure diamond is billions of billions of carbon atoms bonded to one another. If you shrunk yourself down and stood inside the diamond, you'd see nothing but carbon in a perfect pattern in every direction.

I have to report to those of you who think diamonds make a difference that I cannot tell what it is. Seriously, as you all know, they make no difference at all. They just make the flute look a little more special.

Better a diamond with a flaw than a pebble without.

Diamonds are intrinsically worthless, except for the deep psychological need they fill.

Diamond, for all its great beauty, is not nearly as interesting as the hexagonal plane of graphite. It is not nearly as interesting because we live in a three-dimensional space, and in diamond, each atom is surrounded in all three directions in space by a full coordination.

It's not that diamonds are a girl's best friend, but it's your best friends who are your diamonds. It's your best friends who are supremely resilient, made under pressure and of astonishing value. They're everlasting; they can cut glass if they need to.