Gemcutter's Prism

Gemcutter's PrismStack Size: 20Improves the quality of a gemRight click this item then left click a gem to apply it. The maximum quality is 20%.
Shift click to unstack.

A Gemcutter's Prism (often abbreviated GCP) is a currency item that can be used to improve the quality of a gem. Each Gemcutter's Prism will always raise the quality by 1%.

Obtaining

Gemcutter's Prisms are a rare item that can be obtained from slain enemies or found in an Artisan's Strongbox.

One can sell a gem with 20% quality to any vendor for a Gemcutter's Prism.

One can sell any number of gems whose total quality is at least 40% to any vendor for a Gemcutter's Prism.

Divination cards

• A set of 5 Emperor's LuckEmperor's Luck55x CurrencyThe house always wins.¹ can be exchanged for five Gemcutter's Prisms.
• A set of 3 The GemcutterThe Gemcutter3Gemcutter's PrismIn the hands of a master craftsman, a worthless pebble can adorn the crown of a king. can be exchanged for a Gemcutter's Prism.
• A set of 7 The UnionThe Union710x Gemcutter's PrismOn the 21st of Eterni,
  two become one,
  their light outshines
  the setting sun. can be exchanged for ten Gemcutter's Prisms.

¹Not guaranteed (set grants 5 of any random currency)

Spending

Because Gemcutter's Prisms are relatively rare, it is not advised to apply them to gems that have little or no quality. However, selling a Gemcutter's Prism along with a level 20 gem to any vendor will give you a 20% quality, level 1 version of that same gem. Because it is possible to level many gems at once, it is generally considered a cost-efficient method of obtaining 20% quality gems if the player does not have the means to obtain a large number of Gemcutter's Prisms.