The Randomite Ore for 1.7.10 adds a gem that turns into a random item when put in a crafting table. It could be anything from a diamond pickaxe to a stick.
Mining a Randomite Ore will give you a Pile of Randomite Gems. Then put the gems on a crafting table to get a random item. If you are not happy with what you can make with your one pile of gems, try mixing it with some other gems. You will get different items.
Download the Randomite Mod for 1.7.10:
Randomite Mod for 1.7.10
Forge for 1.7.10
Locate your Minecraft.jar file.
Open Minecraft.jar using Winrar and delete the META-INF folder