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Rubi's Rubies by Ruuubi

Adds uncraftable Gems to the game, which can be used as currency, as well as various blocks to promote trading between players.

Rubies Mod by Eric Creation

This mod adds Alexandrite, Tanzanite, Emeralds, Rubies, Lesser Rubies, Steel, and variants of those materials.

Rubik

This is an example mod

Rubik's Cube Block by MuckPie

Decorative Rubik's Cube Block.

Rubis

Rubis!

Ruby Mod by legoman519 AKA 0CaptainMinecraft0

Adds in a Ruby block, ore, armor, and tools

Ruby Mod by Actizer

Ads Ruby, Emerald and Sapphire Tools and Armor to Minecraft

Ruby Tools! by alexs01

A mod that includes OP tools

Ruby-Craft_Mod by JamesDisco13

Adds Rubys to the game, Only to be used in the Ruby-Pack.

RubyCraft

Like rubies? Here ya go!

RubyCreeper

Mo creepahz!

RubyGemMod

Bored Of The Minecraft Items Dont Worry Use This Mod To Get Ruby Minecraft 1.7.2 Updated Bug Fixed Planning For The Next Mod!

RubyRevived (1.12.2) by DogTheLog, MCreator

Enter short description here

RubyUnlished

Find rubies, make powertools and more!

RubyandSapphires

Adds 2 new gems

Rubymods

Dark, Ruby, Action!

Rubyseee

This is an example mod

Rucksacks by RenEvo

Adds colored ruck sacks and an ender ruck sack.