Diablo 4 has a versatile gem called Flawless Sapphire which is crafted with a sapphire and applied to Socketed Equipment. The stone provides various bonuses based on the item it is used in. This piece will give you information regarding flawless sapphire's effects, upgrading it, and where it can be inserted.

Effects of the Flawless Sapphire:

Weapons: When slotted in a weapon, flawless sapphire adds [10.5-1%] Critical Strike Damage to Crowd Controlled Enemies. This effect makes you deal extra damage from critical hits against crowd controlled enemies.

Armor: When slotted into armor, flawless sapphire grants [7-1%] Damage Reduction while Fortified. It reduces your damage taken while fortified hence increasing survivability during combats.

Jewelry: When slotted into jewelry (rings and amulets), flawless sapphire grants [19.6-1%] Cold Resistance. Therefore, this bonus lowers the amount of harm caused by cold attacks.

Upgrading Flawless Sapphire:

To make the Flawless Sapphire more efficient, you can upgrade it to a higher tier. This requires three gems and gold but increases its power when socketing the gem in one piece of gear. You may enhance flawless sapphire to royal sapphire which will offer much stronger bonuses.

Creating Flawless Sapphire:

In order to create flawless sapphires, 3 sapphires gems are required at a cost of 18k gold each for a total cost of 18000 gold coins; as an alternative, players need to find the appropriate crafting station or NPC for this purpose and select “craft flawless sapphire”. After creation it shall go into your inventory until such time that you are ready to use it on any equipment capable of receiving any socketed gem.

Socketing Flawless Sapphire:

Once your character reaches level 10 in Diablo IV game, flawless sapphire can be added to any socketed item that has gem slots available. To get to the socketing interface, right-click on the item you want to change. Click on the gem slot of flawless sapphire in your inventory and insert it. Bear in mind that after the stone has been put inside, there is no chance of removing it expect with help from a jeweler.

Unsocketing Gems:

To change your gear combinations using flawless sapphire, simply go talk to the Jeweler. Unsocket gems without breaking them; this ability is only possessed by jewelers. As a result, you can easily swap out gems between multiple pieces of equipment in order to optimize your character's design based on what you need.

Enhancing Jewelry:

Unlike upgrading weapons and armor at blacksmith's workshop, the bonus resistances and additional stats for rings and amulets are improved by the jeweler. So if you have utilized flawless sapphire in any of your jewelry; its attributes can improve further when you visit him.

Remember that different gem combinations and gear setups should also be tried out so as to find the best build for your character. In Diablo 4, flawless sapphire serves as a useful tool for increasing critical hit damage, improving survivability, and raising cold resistance values.