- +20 Wealth gather rate
- Raises Commerce Limit by +10%
- The 10% Commerce Limit increase are based on the Commerce Limit from the current Commerce research level. For example, if you have researched Commerce 4 (Mercantilism), the Commerce Limit would be 260. Having Diamonds connected would raise the limit by 26 to 286.
- Commerce Limit bonuses given from Wonders (like the +50 Timber/ Wealth from the Colossus) are not taken into account when calculating the 10% (thus, in the above example the Colossus would simply increase the limits for Timber and Wealth from 286 to 336).
The gather rate of rare resources can be increased in various ways, as described in the main article.