Responses
It's not a jewel, it's just the dress that she's wearing at the ball her wrist was broken at. The dress hardly covers her boobs, mainly just the nips.
Following up with the comment above.. Yes, in the cover, she’s wearing a red dress, prob the revealing one she had on in the first chps that barely covered her chest. The white cloth you see is the bandage over her arm lol, not part of the dress.
I just realized something wierd, just look at the cover, FL's boob is completlly exposed you can see that the dress is not covering her breast and that there is a jewel where her nipple is supposed to be idk if this is intentional to make her look like a smuty villainess, a wierd dress desing or complete coincidence, but now i can't overlook it (￣∇￣")