How are lab grown diamonds made?

Lab-grown diamonds are created using two primary methods: High Pressure-High Temperature (HPHT) and Chemical Vapor Deposition (CVD). Both methods replicate […]

how are lab grown diamonds made

Lab-grown diamonds are created using two primary methods: High Pressure-High Temperature (HPHT) and Chemical Vapor Deposition (CVD). Both methods replicate the conditions found deep within the Earth’s mantle where natural diamonds form.

HPHT Method:

  1. Starts with a tiny piece of diamond, called a diamond seed.
  2. The seed is placed in pure carbon and exposed to extreme heat and pressure, similar to conditions deep within the Earth’s crust.
  3. A temperature of around 1500°C and pressure of 1.5 million pounds per square inch are applied.
  4. The carbon melts and dissolves under the heat and solidifies into a diamond due to the pressure.

CVD Method:

  1. Begins with a diamond seed, often created using the HPHT method.
  2. The seed is placed in a sealed chamber with carbon-based gases, typically methane and hydrogen.
  3. The chamber is heated to several hundred degrees Celsius.
  4. The gases break down, and carbon atoms build around the diamond seed, forming a diamond.

The CVD method is newer and less costly than HPHT, but the diamonds often require additional treatment to achieve a colorless state.