Salaam Hasan
You are the one who is linking zeenah to 3awra, whereas the whole verse does not mention 3awra. And BTW, 3awra has nothing to relate it to sex or seual desire, as you have noted yourself in the different verses. 3awar means diappearance of the eye sight, hence a3war means one eyed person. So, "3awra" is anything we do not want others to see (make them blind of it). Why would a necklace be "3awra" just because it is around my neck, or a bracelet just because it is aroung my wrist? What if I am not wearing any jewelry, can I show my bosom? If it is my wrist that should not be seen, then the verse would have given us a "design" for a dress code. But the verse speaks about the zeenah of women.
Unfortunately, no other "zeenah" is mentioned in the qur'aan, but we can understand it from some other derivatives:
41:12; 67:5: the zeenah of the sky is its lamps "stars".
49:7: zeenah of hearts is righteousness "imaan"
10:24: Earth :nature
We can roughly deduce that the zeenah for anything is directly related to it and exclusive to it. To my understanding deduced from this, zeenah of women is something exclusive to them and directly related to them. Jewelry fails this test.