1- A dark base covering the whole gem.
2- On top of this Dark layer, cover 3/4 of the surface with a mid-tone
3- Now underline the Gem with the lighter tone at the bottom of the gem.
4- And add a dot of white on the dark top side of the gem.
For a green gem, I used the following colours from Citadel: Caliban Green (1), Warpstone Glow (2), Moot Geen (3) and White Scar (4).
