1. Enter to this instance
[You must be registered and logged in to see this image.]2. Go to the Red circle area and wait
[You must be registered and logged in to see this image.]3. Look up for this NPC he will run along this path
[You must be registered and logged in to see this image.]4. It take you few hit to killed him and 100% drop 1x green 1x blue ID Gem.
[You must be registered and logged in to see this image.]5. The NPC will respwan every 15 - 20 sec, within 15-20 minutes you will able to farm around 40-50 ID Gem of each green and blue.
Have fun and enoy