Diablo 4 has seven Gem types, which are items that can be slotted in gear with sockets to add different bonuses. In addition, each of these gems has five different level of qualities.

The power and effectiveness of these stat buffs depend on the quality of the Gem, which can be improved by combining Gems of the same type.

Below, we’re going to go over each Gem type, levels of quality, all their stat bonuses, and how to improve their quality.

All Gem Levels in Diablo 4

Each of the seven Gems types in Diablo 4 has five levels of quality that directly impact the potency of the bonuses they apply to your gear:

• Crude Gems
• Chipped Gems
• Standard Gems
• Flawless Gems
• Royal Gems

Here are all the Gem quality levels in Diablo 4, the character level required to use and craft them, and what is needed to upgrade each gem:

You will find varying levels of Gems as you play and explore. Furthermore, you’ll find higher-quality gems as you level up and progress through the game.

As you level up your Gems, their bonuses will increase in power and potency. These quality levels can be upgraded at any Jeweler in the game.

Full Gem Stat Bonus List

Here are all seven Gem types in Diablo 4 and their corresponding stat bonuses, according to gear type:

Here are all the detailed stat bonus percentages for each gem quality level in Diablo 4:

Amethyst – All Gem Level Bonus

• Weapon Bonus (Increases damage over time)
  • Crude: +4.0%
  • Chipped: +5.0%
  • Amethyst: +6.0%
  • Flawless: +7.0%
  • Royal: +8.0%
• Armor Bonus (Reduces damage taken over time)
  • Crude: 4.0%
  • Chipped: 5.0%
  • Amethyst: 6.0%
  • Flawless: 7.0%
  • Royal: 8.0%
• Jewelry Bonus (Increases Shadow resistance)
  • Crude: 11.5%
  • Chipped: 14.3%
  • Amethyst: 16.9%
  • Flawless: 19.6%
  • Royal: 22.1%

Diamond – All Gem Level Bonus

• Weapon Bonus (Increases Ultimate Skill damage)
  • Crude: +4.0%
  • Chipped: +9.0%
  • Diamond: +11.0%
  • Flawless: +13.0%
  • Royal: +15.0%
• Armor Bonus (Increases Barrier generation)
  • Crude: +3.0%
  • Chipped: +3.5%
  • Diamond: +4.0%
  • Flawless: +4.5%
  • Royal: +5.0%
• Jewelry Bonus (Increases resistance to all elements)
  • Crude: 4.0%
  • Chipped: 5.0%
  • Diamond: 6.0%
  • Flawless: 7.0%
  • Royal: 8.0%

Emerald – All Gem Level Bonus

• Weapon Bonus (Increases Critical Strike damage to vulnerable enemies)
  • Crude: +6.0%
  • Chipped: +7.5%
  • Emerald: +9.0%
  • Flawless: +10.5%
  • Royal: +12%
• Armor Bonus (Increases Thorns)
  • Crude: +12
  • Chipped: +28
  • Emerald: +70
  • Flawless: +128
  • Royal: +250
• Jewelry Bonus (Increases poison resistance)
  • Crude: 11.5%
  • Chipped: 14.3%
  • Emerald: 16.9%
  • Flawless: 19.6%
  • Royal: 22.1%

Ruby – All Gem Level Bonus

• Weapon Bonus (Increases Overpower damage)
  • Crude: +12%
  • Chipped: +15%
  • Ruby: +18%
  • Flawless: +21%
  • Royal: +24%
• Armor Bonus (Increases maximum life)
  • Crude: 2%
  • Chipped: 2.5%
  • Ruby: 3%
  • Flawless: 3.5%
  • Royal: 4%
• Jewelry Bonus (Increases fire resistance)
  • Crude: 11.5%
  • Chipped: 14.3%
  • Ruby: 16.9%
  • Flawless: 19.6%
  • Royal: 22.1%

Sapphire – All Gem Level Bonus

• Weapon Bonus (Increases Critical Strike damage to Crowd Controlled enemies)
  • Crude: +6%
  • Chipped: +7.5%
  • Sapphire: +9%
  • Flawless: +10.5%
  • Royal: +12%
• Armor Bonus (Reduces damage taken while Fortified)
  • Crude: 1%
  • Chipped: 1.5%
  • Sapphire: 2%
  • Flawless: 2.5%
  • Royal: 3%
• Jewelry Bonus (Increases cold resistance)
  • Crude: 11.5%
  • Chipped: 14.3%
  • Sapphire: 16.9%
  • Flawless: 19.6%
  • Royal: 22.1%

Skull – All Gem Level Bonus

• Weapon Bonus (Increases Life on Kill)
  • Crude: +2
  • Chipped: +5
  • Skull: +8
  • Flawless: +11
  • Royal: +14
• Armor Bonus (Increases healing received)
  • Crude: 3%
  • Chipped: 3.5%
  • Skull: 4%
  • Flawless: 4.5%
  • Royal: 5%
• Jewelry Bonus (Increases armor)
  • Crude: +75
  • Chipped: +125
  • Skull: +170
  • Flawless: +210
  • Royal: +245

Topaz – All Gem Level Bonus

• Weapon Bonus (Increases Basic Skill damage)
  • Crude: +10%
  • Chipped: +12.5%
  • Sapphire: +15%
  • Flawless: +17.5%
  • Royal: +20%
• Armor Bonus (Reduces damage taken while Control Impaired)
  • Crude: 6%
  • Chipped: 7%
  • Sapphire: 8%
  • Flawless: 9%
  • Royal: 10%
• Jewelry Bonus (Increases lightning resistance)
  • Crude: 11.5%
  • Chipped: 14.3%
  • Sapphire: 16.9%
  • Flawless: 19.6%
  • Royal: 22.1%

How to Find the Jeweler to Upgrade Gems in D4

You can upgrade Gems by combining multiple Gems of the same type and quality at the Jeweler.

You can find the Jeweler in most large towns and settlements in Diablo 4. Just look out for the Gem symbol on your map.

Each Gem type has five tiers of quality and can be upgraded at the Jeweler in the ‘Craft Gems’ tab of the shopkeeper’s inventory screen.

To upgrade your Gems level, you’ll need to combine three Gems of quality and spend a fee of gold to get the next quality level of that Gem.

Being able to slot Gems in and out of your weapons and armor with ease will ensure greater build variety as you stomp about Sanctuary. They have the potential to add a huge amount of power to your gear, especially with the higher-quality Gems you’ll be using in the late game.

What are Gems in Diablo 4?

Gems are items that you can slot into open sockets (if they have them) in your weapons and armor. There are seven Gem types, each with giving different stat bonuses depending on the type of gear piece you slot them into.

You will find Gems from Ore Veins out in the open world and as random loot drops as you go about your business in Sanctuary.

Lastly, you can upgrade your gem level at any Jeweler in the town of your choice.