The elemental composition of diamond is

The correct answer is Pure Carbon.
Key Points

• Diamonds are composed of a single element: carbon.
• The carbon atoms in a diamond are arranged in a crystal lattice structure, which gives diamonds their remarkable hardness.
• Each carbon atom in a diamond is bonded to four other carbon atoms through strong covalent bonds.
• This tetrahedral bonding of carbon atoms is what makes diamond the hardest natural substance known.
• Diamonds are typically formed under high-pressure, high-temperature conditions existing at depths of 140 to 190 kilometers (87 to 118 miles) in the Earth's mantle.

Additional Information

• Graphite
  • Graphite is another form of carbon with a different crystal structure.
  • Unlike diamond, graphite is soft and slippery, making it useful as a lubricant and in pencils.
  • In graphite, each carbon atom is bonded to three other carbon atoms in layers of hexagonal lattices.
  • The layers can slide over each other, which accounts for the slippery nature of graphite.
• Allotropes of Carbon
  • Carbon exists in several different forms known as allotropes, including diamond, graphite, and amorphous carbon.
  • Fullerenes and carbon nanotubes are other well-known allotropes of carbon.
  • Each allotrope has unique properties and applications due to the different ways carbon atoms are bonded together.
• Synthetic Diamonds
  • Synthetic diamonds can be produced in laboratories using high-pressure high-temperature (HPHT) methods or chemical vapor deposition (CVD).
  • These diamonds have the same physical and chemical properties as natural diamonds.
  • Synthetic diamonds are used in industrial applications and jewelry.
• Industrial Uses of Diamonds
  • Due to their hardness, diamonds are used in cutting, grinding, and drilling tools.
  • Diamond-tipped tools are essential in the manufacturing and construction industries.
  • Diamonds are also used in high-performance bearings and in optical devices.