Perfect Emerald

Netherite offers knockback resistance and higher durability.
Perfect Emerald offers faster mining speed, faster attack speed, but very low durability.
A Perfect Emerald Pickaxe with Efficiency V can instant-mine stone with Haste I.

Pickaxe: 500 durability, 16 efficiency
Sword: 400 durability, 5 damage, 2 attack speed (0.5 seconds)
Shovel: 500 durability, 14 efficiency
Axe: 480 durability, 14 efficiency, 7 damage, 1.6 attack speed (0.625 seconds)
Hoe: 200 durability, 14 efficiency
Helmet: 275 durability, 3 Armor ()
Chestplate: 400, 8 Armor ()
Leggings: 375, 5 Armor ()
Boots: 325, 4 Armor ()

Perfect Emerald Armor has 3 Toughness (same as Netherite)
Total Armor: 20 ()

You upgrade diamond tools at a Smithing Table with a Perfect Emerald.
Example recipe with a Perfect Emerald Pickaxe:

The recipe for 1 Perfect Emerald is 1 Cosmatic surrounded by 8 Emerald Blocks (equivalent to 72 Emeralds)

9 Perfect Emeralds together craft a Perfect Emerald Block.
1 Perfect Party Emerald Block can be crafted back into 10 Perfect Emeralds for a full refund.

Having all four armor pieces equipped and all five tools in your inventory at once grants Cover Me In Riches.
Having the pickaxe earns Isn't It Emerald Pick. (see Isn't It A Pick)

Smelting any Perfect Emerald tool or armor yields 1 Emerald Block.

Perfect Emerald has partying properties.
The Perfect Emerald Coated Amethyst Shard and the Perfect Party Emerald Block both emit confetti particles when used.
The Perfect Party Emerald Block is smithed with 1 Perfect Emerald Block and 1 Perfect Emerald.

The block flashes constantly and can be clicked to activate it.

The /partying command requires no special permissions to use and makes confetti.
The *Party* keyboard shortcut also makes confetti

Partying can be entirely disabled with the partyPooper gamerule. (true = no confetti)

All* Perfect Emerald items.

Celebrating this intense Iron Golem VS. Skeleton showdown with confetti.