Emerald And Ruby is a mod that expands on most areas of vanilla Minecraft. It features new ores, multiple new biomes, a few more foods, another dimension, some custom structures, and a new wood type. It also features some tweaks to vanilla such as picking up mob spawners with a silk touch pick.

JEI is highly recommended.

Some extra useful info:

CUSTOM ORE
-Amber ore only spawns ABOVE y 64

MOB SPAWNERS
-Mob spawners can now be picked up with a silk touch pickaxe
-Spawners can have their mob changed with a Spawner Changer
-Spawners no longer drop xp when broken
-When you place a spawner it will always be a pig spawner

STONE WASTELANDS
-You use the Mysterious Device on the Dimensional Rift to get to the Stone Wastelands
-In the stone wastelands dimension the only mob that spawns is slime, so if you hear any other mobs there is a dungeon nearby
-You will need a SECOND Dimensional Rift in order to return
-All players spawn at 0, 0 in the stone wastelands

MISC
-Coffee beans drop from grass
-The accelerator will accelerate the 2 blocks directly beneath it
-All custom armour provides buffs (potion effects)
-There is a new enchantment, Lava Wader. It is basically frost walker but for lava.
-When shooting the compound bow, the arrow seems to go in a randow direction, however it lands in the correct spot

New equipment tiers:

Steel. Same as iron with an extra 100 durability. Gives strength.

Ruby: Same as diamond but with slightly better enchantability and (almost) halved durability (860 instead of 1561). Gives haste.

Amber: Same as diamond with slightly higher attack speed and enchantability. Gives fire resistance.

Emerald. Better than diamond (enchantability, durability [~2300], and mining speed). Gives regeneration 2.

Endore. The end-game ore. 3600 durability, high enchantability, and high mining speed. Armour gives various effects.