That is the exact reason why they are considered to be more than rocks. Their beauty makes them a good market that few other rocks could ever be.

It is true that they are simply a rock, however, their value exceeds that of others because of humans' desire for beauty. That being said, they have been considered to be of more worth than others. Furthermore, they are useful tools, and very plausible to institute as drill heads. Their hardness far exceeds most other rocks. In conclusion, diamonds are considered to have a higher value due to their rarity, beauty, and useful capabilities.