Item from acotar-mist-and-fury by
The Blood Ruby is the Night Court's mark of death, a flawless crimson gem sent to those the High Lord has sentenced, carrying a message no one in Prythian misreads.
A Blood Ruby is the Night Court's official declaration of a death sentence, sent from the Hewn City or from Velaris itself to mark a target for elimination. It is not a threat — it is a promise, and once received, the recipient's name is known to every shadow, every mercenary, and every blade-for-hire in the Night Court's territory. No one who receives a Blood Ruby has ever been known to survive the month, for the Court of Nightmares does not issue empty warnings.
The Blood Ruby is a faceted gemstone the size of a thumbnail, cut into a teardrop shape that seems to pulse with an inner, dark light. Its color is not the cheerful red of a summer rose but the deep, clotted crimson of heart's blood, and it is always warm to the touch, as though freshly drawn from a wound. Set in a simple band of dark, unadorned metal, it is beautiful in the way a blade is beautiful — clean, purposeful, and final.
Also known as: Ruby of Judgment, The Crimson Mark, Night's Sentence, The Warm Stone