Are Women Supposed To Cover Neck And Jewellery Worn There?
She is supposed to cover her bosom. Neck is not included. It is included in the exception given in the verse, that that what stays exposed may stay exposed. Women usually do not cover their necks.
That hadith is not authentic. The statement can be taken as a metaphor for modesty. As it is said, Woman, Thy Name is Beauty. Not every saying is literal. The Quran says that woman can expose their zeenat, which stays exposed. Moreover, God has allowed her to show their hidden zeenat to her mehram relatives. If the whole body of a woman is awrah, it must be covered all the time, just like the private parts.