It is permissible for a woman to enter ihraam with bangles or rings of gold on her hands, and so on, but it is prescribed for her to conceal that from non-mahram men, lest they be tempted by her.
And Allaah is the Source of strength. May Allaah send blessings and peace upon our Prophet Muhammad and his family and companions. End quote.
Standing Committee for Academic Research and Issuing Fatwas
Shaykh ‘Abd al-‘Azeez ibn ‘Abd-Allaah ibn Baaz, Shaykh ‘Abd al-Razzaaq ‘Afeefi, Shaykh ‘Abd-Allaah ibn Qa’ood.
Fataawa al-Lajnah al-Daa’imah li’l-Buhooth al-‘Ilmiyyah wa’l-Ifta (11/190-192).
Shaykh Ibn ‘Uthaymeen (may Allaah have mercy on him) said in Majmoo’ Fataawa Ibn ‘Uthaymeen (22/201): There is nothing wrong with a woman wearing whatever she wants of gold when entering ihraam, so long as that does not reach the level of extravagance, even rings and bangles on the hands, but in that case she should conceal it from non-mahram men lest any temptation occur. End quote.
And Allaah knows best.