Martha

“Maeve went as still as death while Celaena lifted the ring between two fingers.
'I think you've been looking for this for a long time,' Celaena said.

'That does not belong to you.'

'Doesn't it? I found it, after all. in Goldryn's scabbard, where Brannon left it after grabbing it of Athril's corpse-the family ring Athril would have given you someday. And in the thousands of years since than, you never found it so. . . I suppose it's mine by chance.' Celaena closed her fist around the ring. 'but who would have thought you were so sentimental?'

So Celaena said, ' I'll make a trade with you though.' Maeve's browns narrowed. Celaena jerked her chin. 'Your beloved's ring-for Rowan's freedom from his blood oath.”
― Sarah J. Maas, Heir of Fire