Question

why diamonds are most costliest stone

Answer 1

because diamond is the hardest substance and it has the property of more shiny appearance.

Answer 2

Hey friend

__________

Here is your answer

__________

Diamonds are the most costliest stone because They are the hardest substances in the world and Are used in making jewelry. They are expensive as They looked as very beautiful and attract.

___________

Hope my answer helped u.
Plz mark It as Brainliest ☺