When
Sam awoke on the Field of Cormallen, and seeing
Frodo lying next to him, apparently asleep, he thought he had dreamt the entire episode of the trek to Mount Doom and the destruction of
the Ring.
On closer look: Frodo's "one hand [was] behind his head, and the other was resting upon the coverlet. It was his right hand, and the third finger was missing."
The third finger was either the ring finger or the middle finger.
However, I looked up "fourth" finger, the finger monarchs (including English monarchs and the Pope) traditionally wear their coronation/Papal ring on and it is what we call the "ring finger" , the thumb being the "first finger"**. It was always worn on the right hand.***
Hence, I think there could be some debate, where Frodo is concerned, as to what finger it was on.
However, what is is clear from the book and also historically, is that rings of significance were worn on the right hand, and on what we call the "ring finger", and not the pinky.
**If asked "how many fingers does a human have" all but the most pedantic person would answer "ten"... not "eight and two thumbs".
*** I have my own theory about right vs left for a ring of significance or importance.
Latin lesson (bear with me)... Right =
dexter ... left =
sinister.
For those who wear corrective lenses, whether spec or contacts, look at your prescription.
It will say O.D. (and some numbers) and O.S. (and some numbers)
O stands for
oculus =eye.
OD =
Oculus Dexter (right eye) and OS =
Oculus Sinister (left eye)....sometimes they are in English as RE and LE
Now we are familiar with the word
sinister as being untrustworthy or sneaky or flat out
evil.
But it wasn't always so. Anyone who is familiar with [English] heraldry know how the word
sinister is used in describing a coat-of-arms.
It acquired its current meaning because most people are right handed (
dexter manus) and not left handed (
sinister manus).
In meeting a stranger or messenger of assumed goodwill the parties opened their right hand and held it upward palm out, to show they held no
weapon.
But a person of evil intent or treachery who was left handed could do that and yet still capably if not expertly wield a weapon (dagger) in his left hand.
And that apparently happened enough that anyone who was left handed was considered untrustworthy at best.
So the word
sinister came to have a pejorative meaning.
Therefore (I reason) that no monarch who wants his subjects to trust him /her would wear a coronation ring on his/her left hand.
Tolkien, being very familiar with monarchies, would, I think place any Good Guy ring on the person's right hand. ... (just my opinion)