I believe men cannot wear gold rings. Does this ruling also apply to white gold, and other metals such as platinum, titanium, palladium etc (which all look like silver)? Also, would the ruling of white gold differ with different carats?

In the Name of Allah, the Most Gracious, the Most Merciful.

As-salāmu ‘alaykum wa-rahmatullāhi wa-barakātuh.

What is White Gold?
White gold is defined as an alloy of gold and at least one white metal, usually nickel, manganese, palladium, or zinc. To make the gold white, it is combined with metal alloys that are white in nature and plated with an extremely hard element called rhodium. [Refer to notes below]

In principle, men are permitted to wear only silver rings or rings which are plated with silver, with the condition that the silver is limited to a maximum of 4.86g (excluding stone) The head of the ring may be from any type of stone (eg. diamond etc). [1]

Hence, regardless of the amount or purity (carats), it would be impermissible for men to wear white gold. Similarly, it would also be impermissible for men to wear platinum, titanium and palladium. [1][2]

And Allah Ta’āla Knows Best.
Mufti Mubasshir Talha
21 Jumuda Al-Oula / 26 December 2021

Approved by: Mufti Tahir Wadee | Mufti Yusuf Ilolvi

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(فلا يتحلى) أي لا يتزين الرجل (بذهب أو فضة إلا بخاتم ومنطقة وحلية سيف منها) أي الفضة لا الذهب
[Durar al Hukkam, 1/312, Dar Ihya’ al-Kutub]

قال: (إلا بالخاتم والمنطقة وحلية السيف من الفضة) هذا استثناء…قوله: (ولا يجوز للرجال إلخ) أي إلا التختم بالخاتم
[Al-Binayah, 12/110, DKI]

ومنها: الفضة لأن النص الوارد بتحريم الذهب على الرجال يكون واردا بتحريم الفضة دلالة فيكره للرجال استعمالها في جميع ما يكره استعمال الذهب فيه إلا التختم به
[Al-Bada’I al-Sana’I, 6/526, DKI]

ولا يتحلى الرجل بذهب وفضة مطلقا إلا بخاتم ومنطقة وحلية سيف منها أي الفضة
[Al-Durr al-Mukhtar Ma’a Radd al-Muhtar,  6/258, HM Saeed]

وغالب الفضة والذهب فضة وذهب
[Al-Durr al-Mukhtār, 5/553, Farfur]

Amount (weight):
ولا يزيد وزنه على مثقال لقوله – عليه الصلاة والسلام – اتخذه من ورق ولا تزده على مثقال
[Al-Bahr al-Ra’iq, 8/340, DKI]

وينبغي أن يكون قدر فضة الخاتم المثقال ولا يزاد عليه، وقيل: لا يبلغ به المثقال
[Muhit al-Burhani, 5/349, DKI]

مرد کو صرف چاندی کی انگشتری کی اجازت ہے وہ بھی ایک مثقال سے کم
[Fatawa Mahmudiyyah, 19/339, Jamiah Faruqiyyah]

مرد کے لۓ دو شرطوں سے انگھوٹھی پہننا جائز ہے۔
۱) چاندی کی ہو
۲) پانچ ماشے = 4.82 گرام سے کم ہو
نگینے میں کوئی قید نہیں، جس چیز کا بھی ہو اور جتنے وزن کا بھی ہو جائز ہے۔
[Ahsan al-Fatawa, 8/69, HM Saeed]

وأما التختم بما سوى الذهب والفضة من الحديد والنحاس والصفر فمكروه للرجال والنساء جميعا لأنه زي أهل النار لما روينا من الحديث
[Bada’I al-Sana’I, 6/526, DKI]

وفي الجوهرة والتختم بالحديد والصفر والنحاس والرصاص مكروه للرجل والنساء
[Radd al-Muhtar alā al-Durr al-Mukhtār, 6/359, HM Saeed]

وأما التختم بالحديد والرصاص والصفر فهو حرام على الرجال والنساء جميعا
[Al-Fatāwā al-Tatārkhāniyah, 18/125, Maktabah Zakariyah]

وأما التختم بالحديد والرصاص والصفر فحرام على الرجال والنساء
[Barīqah Mahmūdiyah, 5/418, Matba’ al-Halabi]