Which linguistic device is prominently used in the famous De Beers slogan 'A Diamond is Forever' that contributes significantly to its effectiveness and memorability?

In the world of language and linguistics, marketing professionals carefully craft slogans and brand messaging to create powerful psychological connections with consumers. Linguistic devices like alliteration, rhyming, and semantic framing help make brand messaging memorable and effective. This poll tests your knowledge of how linguistic principles have been applied in some of the world's most successful advertising campaigns.

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Metaphorical permanence - linking the physical durability of diamonds with the emotional permanence of love
Alliteration - repetition of the 'd' sound for emphasis
Comparative adjective - using 'forever' as an implicit comparison to other less permanent gifts
Imperative verb structure - commanding the consumer to associate diamonds with eternal commitment