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The meaning and origin of the expression: A diamond is forever

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A diamond is forever

Meaning

Advertising slogan for De Beers' diamonds.

Origin

De Beers have used this as a slogan since 1948, and continue to do so (as of 2012). Here's the announcement of the campaign, from the New York Times' Advertising News and Notes column, August 1948:

"De Beers Consolidated Mines Ltd., owner of diamond workings in South Africa, plans a fall campaign in leading national magazines which will stress the engagement-ring tradition. Four-color ads will reproduce paintings by well-known artists and carry the slogan 'a diamond is forever.' N.W. Ayer & Sons, Inc., Philadelphia, is the agency."

diamondThe slogan began appearing in the US press soon after that date, as here, from the Ohio newspaper The Chronicle Telegram, June 1950.

The notion wasn't a new one. In Anita Loos' book Gentlemen Prefer Blondes, 1925, is the line:

"So I really think that American gentlemen are the best after all, because kissing your hand may make you feel very very good but a diamond and safire bracelet lasts forever."