The Rapture Spark Emerald in Path of Exile 2 is a unique jewel that can be obtained primarily by defeating enemies, as it has a chance to drop randomly throughout the game at any point. You can also acquire it through trading with other players via the official trading system.

To use the Rapture Spark Emerald, you need to socket it into a jewel socket on your passive skill tree. Once inserted, the jewel activates its effects and influences the passives within its radius. The jewel typically grants modifiers that boost Spark-related stats such as increased lightning damage, projectile damage, projectile speed, and other offensive bonuses that enhance Spark’s effectiveness.

How to Find Rapture Spark Emerald:
- Enemy Drops: It can drop randomly from monsters anywhere in the game, so farming areas with high monster density increases your chances.  
- Trading: Use the official Path of Exile 2 trading page to search for and purchase the jewel if you prefer acquiring it through trade.  

How to Use Rapture Spark Emerald Effectively:
- Socket in Jewel Sockets: Place the jewel in a socket near passives that benefit projectile or spell damage to maximize its impact.  
- Build Synergy: Combine the jewel’s bonuses with passive skills and gear that increase lightning damage, projectile speed, and critical strike chance for Spark.  
- Support Gems: Use support gems like Added Lightning Damage, Controlled Destruction, and Faster Projectiles to further amplify the jewel’s effects.  

By integrating the Rapture Spark Emerald into your build, you enhance Spark’s projectile speed and damage, resulting in faster clears and higher DPS. Proper placement and synergy with your passive tree and gear are key to maximizing its benefits.