Diamonds are not an ancient marriage custom. They are a supply operation with a slogan.
De Beers spent the twentieth century teaching people that love has a price tag in carats. It worked. People still line up.
Before the late 1930s, American engagements did not require a diamond. De Beers hired N.W. Ayer. The brief was to make a diamond feel mandatory.
In 1947 Frances Gerety wrote “A Diamond Is Forever.” Advertising Age later called it the slogan of the century. The point was not romance. If owners never sold, the stones already in drawers could not crash the price of new ones.
The “one month’s salary” rule, later two months, was not a tradition. It was copy. Spend in proportion to your ego. The product stays the same.
Celebrity placement, movie product shots, lectures to schoolgirls: the campaign treated culture as inventory.
De Beers spent decades controlling supply — at one point on the order of 90% of the trade. Stones sat in vaults. Soviet production was absorbed rather than allowed to flood the market. Rarity was a policy.
Edward Jay Epstein’s 1982 piece, “Have You Ever Tried to Sell a Diamond?”, is still the assignment. Jewelers mark stones up; they do not want them back. Read it. Then try to sell one.
GIA paperwork and the four Cs describe the object. They do not make the purchase wise. You are still buying a common mineral at jewelry-store retail.
Buying a diamond is worse than buying a car. A car at least does something while it depreciates.
The showroom is a spider’s lair. They smile because you walked in. Markup of 100–200% is normal. The salesperson has a quota, a mortgage, and a script. You have done this zero times. They have done it all week.
They will mention the four Cs, slide a GIA paper across the felt, and punch a calculator toward a fake discount just for you if you buy right now. They do not care if the payment delays a house. They care about this month.
Mining a carat does not cost what you will be asked to pay. The difference is the theater.
Conflict stones financed wars. Mining rips ground and water. Labor in the pipeline has not been a morality play the industry is eager to stage without a certification logo.
Kimberley Process stickers are not a reason to buy. They are damage control. If ethics is the pitch, do not start with a luxury rock.
Lab diamonds are the same carbon lattice. Once they were a rounding error. Then they were half of U.S. engagement stones. Wholesale lab prices fell on the order of 90% as Chinese supply arrived.
De Beers launched Lightbox to box lab stones in as cheap fashion, then wound the brand down when the category they tried to ghettoize ate the market anyway. Anglo American has taken billions in De Beers writedowns. As of 2026 the company that taught the world “forever” was being shopped at a fraction of its old valuation.
If a mined diamond were rare, romantic, and a store of value, none of that would be happening. The industry is discovering what happens when the ad is optional.
Lab-grown is still not an investment. It is a cheaper costume. Moissanite is cheaper still and often looks better. Gold melts. A fund compounds. Pick one of those.
Love does not require a receipt from a cartel.
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