Diablo 4 has the Crude Skull, the most basic gem of all the Skulls. It is only applicable to socketed items, and depending on what kind of equipment it is put in; it has a different effect. In order to make it more potent when equipped, one can upgrade the Crude Skull gem to any higher tier. Here is a guide on using and upgrading the Crude Skull in Diablo 4.

Crude Skull Effects

Different benefits are gained from having the Crude Skull in distinct types of equipment:

Weapons: [0.02-~] Life on Kill

The bonus of Life on Kill is given by the Crude Skull that you insert into any weapon. It means that with each enemy killed, you heal back a bit which goes a long way in self-sustenance while fighting.

Armor: [4-1%] Healing Received

When slotted into armor, the Crude Skull will add further healing received bonuses for your character. This allows for increased efficiency of any type of recovery spells or abilities used by an individual who is wearing such armor during combat.

Jewelry: +[100] Armor

For instance, if you put it on rings or amulets (jewelry), then it will give you some extra points to Armor. With this increase in defensive power, one can endure more damage than they could before aggregate called ‘defense' goes up.

Socketing and Unsocketing Gems

First and foremost, there must be socketed equipment that contains the Crude Skull if anybody wants to use it. These are generally items with holes where gems can be placed. After acquiring socketed equipment, insert your desired gems like Crude Skull into them.

In case you want to remove your gear's Crude Skull or any other kind of gem, ensure that you visit Jeweler's place where he resides within Diablo 4 game world. The Jeweler will pull gems out of your items without breaking them, allowing you to put them in another piece of equipment. Just remember that every time you want to remove a gem, there is often an associated expense either in gold or any other resources so plan out your gem usage well.

Upgrading Crude Skull

The Crude Skull is the lowest level gem, but can be upgraded into Chipped Skull which is a higher tier. Therefore, three more such stones plus some financial resources are needed for upgrading it. For instance, the precise gems necessary for upgrading Crude Skull may vary; therefore, keep on looking for these items.

To upgrade the Crude Skull to Chipped Skull, simply talk to an in-game character (like the Blacksmith) or find/enter the corresponding workshop. In essence, this involves selecting the Crude Skull and its required upgrade ingredients before clicking ok. The end result is a stronger gem with even better effects when inserted into gear as you achieve this aim through interacting with one appropriate NPC or crafting station like Blacksmiths.