Uncut diamond

An Uncut Diamond is used to make a diamond with level 43 Crafting. This gem, when cut generates a random amount of coins per cut. Thus making cutting gems a viable source of gold. When you cut the uncut diamond, you will receive coins depending on how fast/slow you click. You can purchase the uncut diamond from Bob in South neitiznot or in Catherby.

Trivia
Due to the 10/14/2014 update, you are now able to mine from Gem Rocks in Shilo Village.