When used to create tools, weapons, and cannons, rubies give them a red colored, smooth and translucent textured appearance to whatever part is affected.
If you mine during a storm, the drop rate of all gems is much higher than not during a storm. You may get gems multiple times in a row. It is possible to get as little as 1 gem to as many as 4 gems at a single time If you have mining level 0.
Gem equipment has a 1/4 chance of losing durability upon use.
Like all gem equipment, they cause any tool/weapon to have extra damage.
Rubies are given the prefix "Dazzling" if used in carpentry furniture or weapon parts from the blacksmith as a replacement for wood.