Uno A Erre is a goldsmith and jewelry company based in Arezzo Italy.
Additionally, they either produce for or partnered with Gucci brand at some point between the 1970s-1990s. These pieces will be marked by both Uno-A-Erre and Gucci and seem to command a premium.
'uno (minus, really 'menos' in Spanish) uno' = 'one minus one'
uno means one (1). It can also mean the indefinite article "a" or "an".
Uno minuto mas -One minute more
One for all. All for one
One and are (?)
Numeral uno means number one in Spanish. It also means roman numeral one in Spanish which is "I". Edit: "numeral uno" actually means "numeral one". But you probably meant to write "número uno" which means "number one". It does not mean roman numeral one.
What does this mean in jewelry?
If you mean the subtraction, that would be "dos menus uno". If you mean a hyphen, to separate parts of a code, that would be "dos guión uno".
"Uno como tu" means "one like you" in Spanish. It is used to express similarities or comparisons between two individuals.
one
viente uno
Treinta y uno translates from Spanish to mean thirty one.