Is it permissible for a woman to wear gold during Umrah?
Yes it is permissible, but it is obligatory that she refrains from being showy (withher own beauty or decorative objects) or attracting attention.
Should a woman buy new Ihram clothes for Umrah?
No, she does not have to buy new Ihram clothes for Umrah.
Is there any evidence for a particular color to be worn by women for Umrah rituals?
No, there is no evidence for a particular color in a woman’s Ihram attire.