Diamonds are more than just gemstones; they are high-pressure carbon polymorphs that provide a direct window into the Earth’s mantle (150-200 km deep). Unlike crustal minerals, diamonds reach the surface via Kimberlite pipes through supersonic volcanic eruptions, bypassing the graphite-stability zone. For a geologist, each diamond is a pristine mantle sample that has survived a journey of millions of years through the Earth’s crust.