Stack Size: 20
Improves the quality of a gem
Right click this item then left click a gem to apply it. The maximum quality is 20%.

Buyer answer
Gemcutter's Prism is for raising gem quality, usually after your build already has the correct gems and links. It is most useful for important support gems, quality-scaling skill gems, and late-stage character polish.
Each Gemcutter's Prism adds 1% quality to a gem, up to the normal 20% quality cap.
Quality can add damage, speed, duration, area, utility, or other gem-specific benefits.
Players often use GCPs after confirming which gems will stay in the final build.
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