Zero Immortal: How to Upgrade 5-Star Legendary Gem Star Quality

To upgrade the star rating of an equipped 5-star legendary gem in Zero Immortal, consume a matching duplicate that has a higher star count during a rank upgrade. The base gem permanently inherits the higher star rating upon completing the rank-up without losing previous rank investments or requiring extra Gem Power.

How Star Inheritance Works

Five-star legendary gems feature two distinct progression systems: Gem Rank (Rank 1 through Rank 10) and Star Quality (2/5, 3/5, 4/5, or 5/5 stars). Rank determines base stat progression, while Star Quality acts as a multiplier for combat rating and resonance per rank.

You do not need to wait for a natural 5/5 drop before investing resources. You can rank up an accessible 2/5 or 3/5 copy immediately. When a rank upgrade requires duplicate copies of the same gem type, slotting a duplicate with more stars automatically upgrades the base gem to that higher star quality.

Star inheritance is completely non-destructive. Feeding a lower-star duplicate (such as a 2/5) into a higher-star base gem (such as a 4/5) will never reduce the base gem's star count. Once inherited, the boosted resonance and combat rating apply immediately to your current rank level.

Steps to Safely Transfer Star Ratings

Perform star upgrades at the Apprentice Jeweler while observing these verification steps:

1. Lock your high-star gems: Lock your equipped base gem and the high-star duplicate in your inventory to prevent accidental salvage or conversion.
2. Visit the Apprentice Jeweler: Go to Westmarch, open the Apprentice Jeweler menu, and select your equipped base gem for upgrading.
3. Select the specific duplicate requirement: Click the dedicated duplicate gem slot in the rank-up interface.
4. Choose the higher-star copy: Select the duplicate with the higher star rating from your available inventory.
5. Inspect the upgrade preview: Verify that the projected outcome displays the higher star count before finalizing.
6. Confirm the rank upgrade: Complete the upgrade to advance the gem's rank and permanently adopt the higher star rating.

Pitfalls to Avoid

• Feeding high-star gems as generic Gem Power: Star inheritance functions exclusively through designated duplicate gem slots. If a rank upgrade asks for raw Gem Power points, any gem placed in that slot is liquidated into flat power based solely on rank. A 4/5 or 5/5 gem converted into generic Gem Power will not transfer its star rating.
• Consuming valuable tradeable gems: If you obtain an unbound 4/5 or 5/5 gem from an Elder Rift using legendary crests, check the market price before infusing it into a bound gem. Selling an unbound high-star gem for Platinum can often fund multiple lower-tier duplicates and the raw Gem Power needed for faster account progression.