Question

Short note on diamond

Answer 1

Diamond is an allotrope of a non metal Carbon..It is the hardest known substance in the world..

Answer 2

Diamond is a stone considered as most precious in today's world. It is made up of carbon atoms.each atom is joined to 4 neighboring atoms making it the hardest substance found in nature.its density is 3.5gm/cm cube. and it is a poor conductor of electricity becoz it doesn't has free electrons.
hope it helps!
from vinay :)