How to Use the Jeweler in Vampire Crawlers

Vampire Crawlers players can unlock the Jeweler by finding the Lapidary Loupe relic in Gallo Tower.

Once unlocked, the Jeweler at the village Blacksmith can raise or lower gem rarity to influence drop rates.

This lets players steer runs toward the gem types they want, though it costs a lot of coins.

The system even allows sealing Ultra Rare gems, but at a steep price.