basic permissibility

ringer made out of iron

Question Is it correct that it is not allowed for a woman to wear rings / jewellery made from other than gold and / or silver?   I have seen this mentioned in the following links and would like to know whether this is soundly established: http://islamqa.org/hanafi/daruliftaa/7739 http://youtu.be/FgDmXlE0yHY Answer There doesn’t appear to be sound evidence from the book and the Sunnah to establish a prohibition specifically relating to women