Sell her the Magnificent Diamond
From Fallen London Wiki
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From: The Matter of Neathy Commerce
Her eyes glisten as you remove it from the bag.
Game Instructions: Sell the Diamond via the Bazaar tab to continue. On desktop, the tab is above the story content. On mobile, tap the circular Echo symbol in the bottom right.
Locked with 
1 x A Mislaid Diamond
Success
A Diamond in the Fluff
In Fallen London, the Bazaar is a constant presence [...] The sidestreets around it are reserved for the city's more influential types - which you are very much not, yet [...] There's money to be made by those with something to sell.
