Turquoise is a feminine noun and adjective in French. It has no masculine.
It is a French noun, so it is the same, "turquoise".
In French, "sandwich" is a masculine noun. So you would use "un sandwich" for "a sandwich."
A book is 'un livre' (masculine noun) in French.
Le Portugal is a masculine noun in French.
Un fauteuil is a masculine noun in French.
A lemon is 'un citron' (masculine noun) in French.
'un stylo' is a masculine, noun in French. 'stylos' with the additional 's' is a plural noun, but still masculine.
Salmon is "saumon" in French. It is a masculine noun.
The abbreviation DVD is considered masculine in French. ("un DVD")
It is a masculine noun
masculine
'Un restaurant' is a masculine noun in French.