When you play Path of Exile 2, you will often pick up skill gems and wonder whether they are worth upgrading with a Gemcutter’s Prism (GCP). Because GCPs are valuable PoE 2 items, using them wisely can help your character grow faster and save you resources. Below is a simple, clear guide—on how to judge whether a gem deserves a GCP, plus some real gameplay tips you can actually use....