Ah, the humble recon photo, the unsung hero of many a caper.
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The Large Diamond is a type of loot that can be pickpocketed in Sly 2: Band of Thieves and Sly 3: Honor Among Thieves. It is more valuable than the Small Diamond and Medium Diamond. It is worth 137 coins in Sly 2, and 147 coins in Sly 3.