The distinction method is as follows:

1. Observe the color and texture: artificial diamond pens show uniform and consistent color and texture, while natural diamond pens will show natural color and texture changes , has the natural characteristics of minerals.

2. Conduct a hardness test: Artificial diamond pens are harder and can be used to scratch other materials, while natural diamond pens have different hardnesses and cannot scratch hard objects such as glass.

3. Understand the source and production method: Artificial diamond pens will have the manufacturer's logo, while natural diamond pens will have information about the ore or mine.