Welcome to the Cube — but read the tiny print
After finishing the Lord of Hatred expansion you get access to the Horadric Cube in Temis. It’s a funky little thing that can alter gear, replace stats, and generally do weird transmutations — including messing with sockets and gems. Problem is, the game barely explains one of its best tricks: Amalgamation. That’s the button you press when you want to turn a pile of regular bling into something truly stupidly powerful.
So what exactly is Amalgamation?
Amalgamation is the Cube option that lets you combine multiple items of the same type to produce a higher-tier version. In practice it’s only useful for consumables, dungeon keys, and sockets — meaning gems. Not every gem can be mashed together though; the mechanic is aimed at the upper tiers, not the common pebbles you find everywhere.
The shiny upgrade chain: Grandiose → Horadric → Flawless
Here’s the simple progression: five Grandiose-tier gems of the same kind can be merged into one Horadric Gem of that type (ruby, emerald, skull, etc.). Then, take five Horadric Gems and combine them to create a Flawless Horadric Gem — the absolute peak gem for your socket slots. That last step is what makes your gear go from “meh” to “oh wow, that killed the world.”
Numbers that actually matter
To give you an idea of the jump: Horadric Gems give noticeably larger stat bumps than Grandiose gems (think higher stat numbers on armor, a bigger damage percent on weapons, and much stronger elemental resistance on jewelry). Flawless Horadric Gems break things further — higher flat stat gains on armor, a heftier damage multiplier for weapons, and huge resistance numbers for jewelry. In short: Horadric is better; Flawless is bonkers.
Why you’ll probably need to craft them
Finding Grandiose gems as drops is painfully rare. At difficulties above Torment V the drop chances are minuscule (sub-1% in some brackets), and even in very high torment tiers the rate is still low (single-digit percentages). That means instead of waiting for RNG to be merciful, most players craft Grandiose gems. Spoiler: it costs a lot.
What each crafted Grandiose gem costs
To make a single Grandiose gem you’ll need a huge stack of resources: millions of gem fragments (the original item fragment, not the finished gem), a thousand soul fragments, and tens of millions of gold. Those numbers are real and they’re not cheeky — crafting is expensive because the result is valuable.
Where to farm the ingredients (the fast and the lazy)
If you want to actually build Horadric or Flawless gems without crying into your keyboard, focus on these activities:
Infernal Tides for soul fragments
Infernal Tides are the best regular source of soul fragments. The events themselves and the Helltide boss drop a ton of them, and you can also snag shards from the mystery chests unlocked with aberrant shards. Expect sizable hauls per tide — usually in the hundreds — so this is where you should spend a lot of your playtime if you care about crafting endgame gems.
Dungeon farming for gem drops
Certain dungeons are known to drop legitimate gems more often than open-world mobs. Players have reported a specific dungeon that’s quick to clear and whose boss drops real gems fairly reliably. When you dismantle those gems at the jeweler they give fragment chunks (commonly in the tens of thousands), and those fragments can be converted into whatever gem type you need, so the grind is bendy if you play it smart.
Make the gold (without grinding for days)
Gold costs are huge, but accessible: running War Plans, tackling Nightmare Dungeons with “Gold” runes active (particularly at Torment V and above), and selling surplus loot can net you millions per hour. Nightmare runs with appropriate modifiers commonly return a few million gold, so choose routes that give both currency and useful drops.
Practical priorities
Don’t blow your soul fragments on random upgrades. Save them for the recipe-heavy stuff like Grandiose gems (and other late-game enchants). Run Infernal Tides for a steady soul supply, clear the gem-friendly dungeon runs for raw fragments, and rotate Nightmare or War Plan runs to keep your gold pile happy. If you’re trading or selling on your server economy, factor that into your crafting plan too.
Final pep talk (and a tiny warning)
Yes, the Horadric Cube’s Amalgamation is the most under-advertised way to get the absolute best gems in Diablo IV — but it’s intentionally expensive and grindy. If you want Flawless Horadric Gems, prepare for resource management, a little repetitive farming, and a solid stash of patience. Do that, slot the gems, and then watch the game bend to your ridiculous new stats. Happy crafting, you gem-hoarding menace!
