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Beyond John Smithers's excellent answer... If you don't have the proverbial thorn for Androcles to remove from the lion's paw, you can choose something which is symbolic in general, so people imme...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/10392 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
Beyond John Smithers's excellent answer... If you don't have the proverbial thorn for Androcles to remove from the lion's paw, you can choose something which is symbolic in general, so people immediately understand what it means. For example, if A presents B with a diamond ring, and B wears it on the left ring finger, in most of the western world that's an engagement ring. A claddagh ring (two hands clasping a heart) is often given as a friendship ring, which would work well here. [http://en.wikipedia.org/wiki/Claddagh\_ring#Usage\_and\_symbolism](http://en.wikipedia.org/wiki/Claddagh_ring#Usage_and_symbolism) Similarly, if you want to emphasize their interconnectedness in the story (destiny, the idea of soulmates, the idea that they will always be joined, reincarnation, etc.) you could try an Ourobouros (snake eating its own tail) or a ring with Celtic knotwork all around, so that the design is infinitely intertwined. (Those three are also all Irish/Gaelic/Celtic in origin, I believe, so they'll dovetail with your setting. But you could tweak it for any location.)