...which he wears continuously for the rest of the story:

Archangel Michael

doesn't have a ring in Book of Job:

and then they do:

Uriel does:

...even Saraqael does:

...and Sandolphon:

...but not the Supreme Archangel

not in Book of Job:

and neither before Armageddidn't:

nor after:

...and not the 37th Order Scrivener:

Originally I thought the rings might denote rank, but Gabriel not having a ring throws a wrench in that.

Left vs. Right

Every angel that wears a ring wears it on their left hand (everyone except Saraqael wears it on their pinky, who wears it on their ring finger) except for Aziraphale, who consistently wears his pinky ring on his right hand. Furthermore, the style of each ring appears to be unique; we don't usually get a very good look at them (or at least I don't, I have kind of crappy hardware) but the differing styles seem to be meaningful to the individual. Putting it on the left may indicate that it has a negative connotation; the fact that Aziraphale's ring is on the right sets him apart.

Protecting the Ring

Additionally, all the angels that have rings, when they fold their hands, tend to cover up their ring-bearing hand, almost protectively:

Semi-Rational Theory

The rings are vessels of memory: they are only worn by angels who have transgressed against God's will, and are worn forever after as a symbol of the covenant made between the Creator and the Servant. They dump the memories of their transgressions into the ring so that their minds are made clean, but carry the mark of their prior sin with them for the rest of time. Much like a rainbow, it serves as a promise that the transgressor will never transgress again. The angels protect it because, consciously or not, they know that this ring contains a part of themselves, and it is both precious and shameful.

Absolutely Irrational Theory

Aziraphale wears his ring on his right hand because it doesn't fit on his left. That's because it's not actually his ring; it is Angel!Crowley's, and he is keeping it safe for them. Crowley and/or Aziraphale might not even know anymore that that is what it is, but by some pact between them made before the Fall, it is in Aziraphale's stewardship to keep safe until such time as Crowley can safely have his memories restored.

Again: Please do not ask Neil Gaiman to confirm or deny.

EDIT: MAGGIE HAS A PINKIE RING

This bish is sus AF

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If you would like to reblog, please reblog from this repost with additional content and references.

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To read more of my original content on erasure theory:

Jimbriel, Satan, the Book of Life, and what it means for Crowley

The Erasure of Human!Metatron

Baraqiel and Azazel

or, my first and my most popular post to date: