@feld Nothing, they just have different bands of color in them which I will wear to match my color (tie/shirt) for the day.
I only have a few rings that mean anything:
Freemason ring - self explanatory
Legend of Zelda ring - self explanatory
Silver ring - Occult symbolism for water/moon
Hemetite ring - Occult symbolism for earth
Gold ring - Occult Symbolism for fire/sun
PELE ring - Supposed ring of solomon according to Enochian tradition, gives one control over demons
A few of the rings above have inner band engravings to symbolize their various nature, usually using a loagath.
The colored ones have no meaning to me other than color matching.
Many of my other rings have some symbolism to them, some are for fun. The ones that have meaning are the plain metal ones mostly. I do have some engraved with sacred symbols (like my PELE ring), but I dont usually wear those day to day as I beleive it is important to not advertise ones spirtual views, and in fact go out of your way to keep it to yourself in most cases.
To give you an idea my silver rings (not shown) have an engraving on the inside of the band that say "Graa" which is Enochian for "Moon". The gold one I have is inscribed with "Ror" which is the Enochian word for "Sun". Sadly they use english script but true Enochian would use the Enochian script.
@freemo @feld did you buy them purely for color matching or do they hold any personal meaning and value to you beyond color?