GemCraft by Sanguine045
Ever think that emeralds are a vastly underimplemented part of the game? well here you go! this mod adds two more types or gemstone (sapphire and ruby) as well as full tool and armor sets for all three types of gem.
MinersAdvantage by DuelMonster
MinersAdvantage is a reimagening of my previous mod 'SuperMiner'. It is a rewrite from the ground up that aims to solve all previous issues and to add additional features.
mod_DirtCraftsDiamondsMod by StanLeonard, MCreator
Why go down those caves just to not find diamonds? And when you do find it, You have to smelt it, and first you have to risk your life near lava and climb up and things. Well turn that useless brown dirt into usefull diamond gems!