Diamond

How to Get
You can get diamonds in the following ways:
 * 1% drop rate from Rats
 * Very Rare drop chance from mining stone lumps
 * Extremely Rare drop chance from opening Loot Chest

Usage
Diamonds can be used for upgrading special weapons such as Legendaries. Some people also value them as trading currency for expensive items.

Trivia

 * Diamonds used to be upgrade material for some Legendary weapons in Early Access before the introduction of new materials.