Definitions

[1] The Council defines a "diamond" as:
A natural mineral consisting essentially of pure carbon crystallised with a cubic structure in the isometric system. Its hardness in the Mohsscale is 10; its specific gravity is approximately 3.52; it has a refractive index of 2.42 and it can be found in many colours.

[2] The Council defines "gold" as:
A rare yellow metallic element with the chemical symbol "Au". It is a mineral with specific hardness of 2.5-3 on the Mohsscale of hardness and the atomic number 79. Gold purity is measured by karat: one karat being 1/24th part by weight of pure gold.