Narrated Saeed ibn AbulHasan: The pommel of the sword of the Messenger of Allah ﷺ was of silver. Qatadah said: I do not know that anyone has supported him for that (for the tradition narrated by Saeed bin Abu al-Hasan).
Related hadith on this topic
Explanation & Benefits
Shaykh Umar Farooq Saeedi
Benefits and Issues:
It is permissible for the mujahid to adorn his weapon in this manner.
Source: Sunan Abu Dawood – Commentary by Shaykh Umar Farooq Saeedi, Page: 2583