This is the 6645th most frequent Catalan word.
rubí
Ruby.
In this context, 'rubí' designates a precious gemstone.
M'he comprat un collaret amb un rubí preciós.
I bought a necklace with a precious ruby.
Here, 'rubí' refers to a specific reddish color, descriptive of the wine.
El color rubí del vi és impressionant.
The ruby color of the wine is impressive.
In this sentence, 'Rubí' is a proper noun, the name of a town in Catalonia, Spain.