A trophy?
From Fallen London Wiki
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From: Unpredictable Treasures
A board of knotted oak bearing four green stones imprisoning twisted bones. A blue glint at the centre.
Unlocked with 
Uncovering an Unpredictable Treasure: 20–37
Success
Some deeper intrigue
The lettering on the board is almost erased by time, but you can make out 'ALLIES... DEVOURING....ROSE'. If your interpretation is to be trusted.
You've gained 4 x Unearthly Fossil
You've gained 1 x Nodule of Trembling Amber
You've learnt what the Treasure was. (Removes all 
Uncovering an Unpredictable Treasure:)
