@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.
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.