Seize a jewel smuggler's boat
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From: Larceny at Jericho Locks
A bigger prize, but you will need to take the whole vessel; it is too much weight to shift the boxes by hand.
Unlocked with 
Casing... 8
Success
River piracy
Your crew of marauders row at a fast clip, ramming the jewel smuggler's boat over and over until he jumps overboard. [...]
The boat's contents prove worthwhile: piles of diamonds of varying sizes. Even split seven-wise among the crew, it's a good haul.
Casing... is dropping… (-36 CP)- A Marauder of the Clay Highwayman is increasing… (+2 CP)
You've gained 2 x Magnificent Diamond
