It can be obtained from a headstone in the ruins of Old Tien's Landing, opposite the entrance to the quarry.
In-game description: "In the reign of the Empress Sun Lin, arts flourished, especially dancing and poetry. The Empress surrounded herself with beautiful young women, masters in their respective art forms. The most admired, and most talked about was the dancer called the Divine Rose. When the Empress' life was cut short, Divine Rose was heartbroken and wept for days, dying from grief shortly thereafter. Legends say that her tears of grief are what gave power to this gem, imbuing it both with her grief and her passion."