Retail jewelers generally prefer not to buy back diamonds from customers because the offer they would make most likely would be considered ridiculously low. The "keystone," or markup, on a diamond and setting may range from 100 to 200 percent, depending on the policy of the store. If they bought diamonds back from customers, they would have to buy them back at the wholesale price. Most jewelers would prefer not make a customer an offer that not only might be deemed insulting but would also undercut the widely-held notion that diamonds hold their value. Moreover, since retailers generally receive their diamonds from wholesalers on consignment and need not pay for them until they are sold, they would not readily risk their own cash to buy diamonds from customers. Rather than offer customers a fraction of what they paid for diamonds, retail jewelers usually recommend their clients to other firms

women can no longer expect to be provided for throughout their lives
Up until this point [1938], however, American men tended to buy the smaller and poorer quality diamonds, averaging under $80 apiece, for their loved ones. Oppenheimer and the bankers believed that Americans could be persuaded to buy more expensive diamonds through an advertising campaign…Since "young men buy over 90% of all engagement rings," it would be crucial to inculcate in them the idea that diamonds were a gift of love: the larger and finer the diamond, the greater the expression of love. Similarly, young women had to be encouraged to view diamonds as an integral part of any romantic courtship......N. W. Ayer outlined a far more subtle program which included arranging for lecturers to visit high schools across the country. "All of these lectures revolve around the diamond engagement ring, and are reaching thousands of girls in their assemblies, classes and informal meetings in our leading educational institutions," it explained in a memorandum to De Beers. The advertising agency also organized in 1946 a weekly service called "Hollywood Personalities," which provided 125 leading newspapers with descriptions of the diamonds worn by "screen stars."

It turns out that these people have plenty of leisure time, sleep a good deal, and work less hard than their farming neighbors. For instance, the average time devoted each week to obtaining food is only 12 to 19 hours for one group of Bushmen, 14 hours or less for the Hadza nomads of Tanzania. One Bushman, when asked why he hadn’t emulated neighboring tribes by adopting agriculture, replied, "Why should we, when there are so many mongongo nuts in the world?"Which means that the "mining beats looking for nuts and berries" argument lacks further factual basis. (Not that there was a hell of a lot of evidence thrown around on that one, anyways.)
-- The Worst Mistake in the History of the Human Race by (ironically enough) Jared Diamond

Except for those few stones that have been permanently lost, every diamond that has been found and cut into a gem since the beginning of time still exists today. This historic inventory, which overhangs the market, is literally in the public's hands. Some hundred million women wear diamonds on their person, while millions of others keep them in safe deposit boxes or strong boxes as family heirlooms. It is conservatively estimated that the public holds more than five hundred million carats of gem diamonds in this above-the ground inventory, which is more than fifty times the number of gem diamonds produced by the diamond cartel in any given year.
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posted by gunthersghost at 11:42 PM on January 9, 2006