Claim: Are diamonds formed from compressed coal?

The claim that diamonds are formed from compressed coal is false. Most diamonds are older than land plants, which are the source of coal, and coal rarely reaches the depths required for diamond formation. Mainstream geological sources consistently debunk this myth, emphasizing that diamonds primarily originate from carbon sources in the Earth's mantle or through subduction processes. Alternative sources may perpetuate the misconception due to its prevalence in popular culture, but scientific evidence strongly contradicts it. The models diverge sharply — treat this as higher-uncertainty. Perplexity comes in highest (95%), while Gemini is lowest (5%). There are no significant opposing claims in the evidence provided. The consensus among geological experts is clear that diamonds do not form from coal, as most diamonds predate the existence of coal-forming plants. While some might argue that coal could contribute to diamond formation in rare geological conditions, this is not supported by the majority of scientific literature, which emphasizes other carbon sources. Therefore, the absence of credible counter-evidence reinforces the conclusion that the claim is false.