Gems and Crafting
Gems receive improvements in Season 4, aimed at Diablo 4 Items simplifying their use and enhancing crafting

possibilities:

Improved Crafting Tail: Enhances the process of socketing and upgrading gems.
Expanded Utility: Gems play a crucial role in augmenting item properties and enhancing overall character performance.
These enhancements ensure that gems remain integral to item customization and character progression throughout all stages of gameplay.

Class Changes and Balancing
Alongside item updates, Season 4 introduces significant adjustments to class abilities and balance:

General Updates: Various skills and abilities across all classes undergo revisions to improve gameplay diversity and balance.
Specific Nerfs and Buffs: Adjustments such as reducing specific item damages and tweaking inherent class mechanics aim to refine the overall player experience.
These changes reflect Blizzard's commitment to buy Diablo 4 Items maintaining a dynamic and engaging gameplay environment, where each class offers unique strategic advantages and challenges.