Diamond is the hardest mineral, consisting of pure cubic carbon. It is often used as a decoration on watches, including on markers and in a pave pattern.
| River + | D | Very fine white + |
| River | E | Very fine white |
| Top Wesselton + | F | Fine white + |
| Top Wesselton | G | Fine white |
| Wesselton | H | White |
| Top Crystal | I-J | Slightly tinted white |
| Crystal | K-L | Tinted white |
| Top Cape | M-N | Tinted 1 |
| Cape | O | Tinted 2 |
| Light Yellow | P-Y | Tinted 3 |
| Yellow | Z | Tinted 4 |