Diamond

Diamond is a precious gemstone made entirely of carbon atoms arranged in an extremely hard crystalline structure, which makes it one of the hardest natural materials known to science. This exceptional hardness, combined with its ability to sparkle brilliantly due to how light passes through it, is what makes diamonds so valuable for jewelry and also useful in industrial applications like cutting and polishing tools. Diamonds form deep underground under intense heat and pressure over billions of years, and are brought to Earth's surface through volcanic eruptions.