Reference article
Diamond Heist
Enter Waterfall Mansion and retrieve the big diamond from the garden while avoiding security guards’ sight.
Completing the quest
Enter Waterfall Mansion and retrieve the big diamond from the garden while avoiding security guards’ sight.
Quest items
Keep quest items in the inventory until their task is complete.
Rewards
Related activities
This is one of the 21 side quests in 
Duck Life 8: Adventure. See 
Quests for the full list.