Castleville how to get diamond

Here is a hint and tip how to get a diamond in castleville game.
Diamonds in castleville can be found when you harvest tend piles of rocks or when you tend to your own mining camp, also to make things better you can harvest your neighbor's rocks and get a diamond, its hard to get one so, its better to tend your neighbor's rocks that way you don't use energy. Below are the rocks you need to harvest, and only these rocks not any other ones.

Castleville game rocks