A Ruby is a red gem used in Crafting and Fletching. An uncut ruby can be cut by a player with level 34 Crafting by using it with a chisel, making it into a ruby and granting 85 Crafting experience.
Uncut rubies can be obtained through Random event gifts, randomly from Mining ores, and as drops from monsters. A one-time reward of two cut rubies can be obtained by using a chisel and hammer on Thammaron's throne during The Golem quest. Four cut rubies are also obtained as a reward for completing Olaf's Quest.