Reference: Fataawa Noor ‘alad-Darb – Question No.5750, Page 198, Volume 11
Question: O noble Shaykh, what is the correct approach to wearing a ring?
Response: As for the issue of wearing a ring, then it is not a Sunnah which is required [of us to emulate] – whereby everyone is required to wear a ring. However, if a need arises for wearing one, then it is from the guidance of the Messenger (sal-Allaahu ‘alayhi wa sallam) to wear one. That is because when the Messenger of Allaah (sal-Allaahu ‘alayhi wa sallam) was told that the kings [and rulers] of his time do not accept any letters without a seal (stamp), he then took to wearing a ring in order to stamp the letters which he sent to them. So whoever is in need of [something like] that – such as a leader or a judge or other than them, then his taking to wearing a ring would be in accordance to [the guidance of] the Messenger of Allaah (sal-Allaahu ‘alayhi wa sallam); and whoever does not have a need for doing so, then it is not from the Sunnah for him to wear a ring.
 al-Bukhaaree – The Book of Knowledge, hadeeth no.65 and Muslim – The Book of Clothing and Beautification, hadeeth no.2092