To increase a five-star Legendary Gem's star rating in Diablo Immortal, consume a duplicate copy of the same gem with a higher star count during a rank upgrade at the Apprentice Jeweler. The base gem permanently adopts the higher star rating, and its Resonance and Combat Rating immediately adjust upward to reflect its new quality at its current rank.
You do not need to obtain a natural 5/5 gem before investing resources. Upgrading an affordable 2/5 gem allows you to progress its rank immediately and inherit a higher star rating later without losing any invested Gem Power.
When Star Quality Can Increase
A gem can only inherit a higher star rating during rank upgrades that require duplicate gem copies. Because early rank progression relies purely on raw power, your upgrade opportunities depend on the target rank:
- Rank 1 to Rank 2: Requires only Gem Power. You cannot increase star quality during this upgrade because no duplicate copies are used.
- Rank 2 to Rank 3: Requires one Rank 1 duplicate of the identical gem plus Gem Power. This is the earliest point where you can insert a higher-star duplicate to raise gem quality.
- Rank 3 to Rank 4: Requires one Rank 1 duplicate of the identical gem plus Gem Power.
- Rank 5 and Higher: Requires multiple duplicate copies, including duplicates upgraded to Rank 3.
| Target Rank | Duplicates Required | Star Upgrade Available? | Upgrade Cost Components |
|---|---|---|---|
| Rank 2 | 0 | No | Gem Power only |
| Rank 3 | 1 (Rank 1) | Yes | Gem Power + 1 duplicate |
| Rank 4 | 1 (Rank 1) | Yes | Gem Power + 1 duplicate |
| Rank 5 | Multiple | Yes | Gem Power + multiple duplicates |
Step-by-Step Star Upgrade Process
Always initiate the upgrade using your existing, higher-ranked gem as the base target. If you mistakenly select the loose Rank 1 duplicate as the base, you will lose your invested ranks.
- Travel to the Apprentice Jeweler in Westmarch and open the Manage tab.
- Select your equipped or highest-ranked gem as the primary base item.
- Open the Upgrade menu to view the duplicate slots and required Gem Power.
- Manually click the duplicate material slot and choose your higher-star copy.
- Check the preview window to confirm that the resulting gem reflects the higher star tier.
- Finalize the upgrade to apply the new star rating.
Lock valuable high-star duplicates in your inventory until you are ready to use them. This prevents the game from auto-filling them as generic Gem Power in unrelated upgrades.
Inheritance Rules and Restrictions
Star quality upgrades are permanent and subject to several specific rules:
- No Downgrades: Consuming a lower-star duplicate into a higher-star base will never reduce your gem's quality. For example, feeding a 2/5 duplicate into a 4/5 base gem preserves the 4/5 rating.
- Irreversible Consumption: Once a duplicate gem is consumed for an upgrade, it cannot be extracted or recovered.
- Highest Rating Priority: If an upgrade requires multiple duplicates and includes more than one star tier, the base gem inherits the highest star rating among all consumed copies.
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James Brown
James focuses on Android gaming on PC, emulator setup, controls, performance tuning, and practical troubleshooting for longer play sessions.
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Player Comments
118 players commented on this guide.
This guide answered the exact question I had.
The explanation is clear, especially for beginners.
Nice guide. I am checking the other Diablo Immortal articles next.
The tips are practical and easy to follow.