Darling, yes, of course I admire the necklace, with a delicate ruby, that I gave you, but my eyes drift to that tender hollow between throat and chest-bone, then to the color of your skin--and to lines suggested by your collar-bones. Then up my gaze goes to your face, a smiling face, which now becomes a slightly suspicious visage. There's everything to admire there.
And then of course your hair, which now I kiss and sniff--your suspicions verified: I've lust not jewelry on my mind.
It's not as if the necklace is irrelevant, oh no. It's just that it's the starting point on the treasure-map, the map and treasure both being you.