In the context of lab-grown diamonds (LGDs), what is used as a diamond seed?

Correct answer: (c) Graphite

Explanation

Lab-grown diamonds (LGDs) are made by the HPHT (High Pressure High Temperature) or CVD (Chemical Vapour Deposition) methods.

Both methods begin with a thin slice of graphite (pure carbon) used as the diamond seed on which carbon builds up.

White sapphire, moissanite and cubic zirconia are diamond simulants, not the carbon seed.