Finish the following sentence with the best choice: To tell a real diamond from a fake.

Choices:
- Try using fog - try to fog it up with a fog machine. Glass will stay fogged much longer than diamond.
- Try using fog - try to fog it up with your mouth like a mirror. Glass will stay fogged much longer than diamond.

Answer:
Try using fog - try to fog it up with your mouth like a mirror. Glass will stay fogged much longer than diamond.