- What is the hardest substance on earth?
- What is the rarest gemstone in the world?
- Can you crush a real diamond?
- Can diamonds burn or melt?
- Do diamonds burn in lava?
- What does a burnt diamond look like?
- Can a diamond withstand heat?
- Can Diamond Be Broken?
- Can a diamond conduct electricity?
- How do you tell if a diamond is real with a flashlight?
- How durable is a diamond?
- Can acid destroy a diamond?
- At what temperature do diamonds melt?
- What can destroy a diamond?
- Can you break a diamond with a hammer?
What is the hardest substance on earth?