Natural diamonds are diamonds that form in nature, deep inside the Earth, rather than being made in a lab.
Here’s a clear explanation:
What are natural diamonds?
• They are made of pure carbon.
• They form about 150–200 km (90–125 miles) below the Earth’s surface.
• They develop under extreme heat and pressure over 1 to 3 billion years.
• Volcanic eruptions push them closer to the surface, where they can be mined.