A kiss on the hand
From Slate's Dear Prudence column (scroll down to the second Q&A).
Following (the questioner's) thinking, no woman should accept any piece of jewelry if she does not approve of the reason it was given. Were this the case, women would have many fewer baubles, and jewelry stores would be in tough shape. It is actually quite easy to dissociate a piece of jewelry from the donor. Don't ask Prudie how she knows this.