How did De Beers marketing campaigns influence diamond demand in the 20th century?

• A. They introduced lab-grown diamonds.
• B. Campaigns like 'A Diamond Is Forever' linked diamonds to romance and commitment, creating enduring desire and stabilizing demand.
• C. They reduced mining output to create price spikes.
• D. They discontinued advertising.

Answer: (B)

The idea being tested is how advertising can shape and stabilize consumer demand by attaching emotional and social meanings to a product. De Beers did this exceptionally well with campaigns that linked diamonds to romance and lifelong commitment, most famously with the slogan “A Diamond Is Forever.” By repeatedly portraying the diamond as the ultimate symbol of enduring love and a symbol that every engagement ring should include, they created a social expectation: a diamond is an essential part of marriage proposals and weddings. This emotional messaging shifted consumer behavior from viewing diamonds as a luxury gift tied to scarcity to seeing them as a lasting, universal standard for commitment. As a result, demand became more persistent across generations, helping to stabilize demand and support higher prices even when production or other market conditions fluctuated. The other options miss the central idea here: the campaigns themselves didn’t introduce lab-grown diamonds, nor were they about reducing output to spike prices or about stopping advertising; the power comes from the cultural association fostered by the marketing.