I read that as "a bright turquoise ear", which would indeed be a distinctive attribute.
Alexa, I think you have a point about the paintbox colour names. Many of us learned to name and categorise the colours according to what was in our paintbox, our set of coloured pencils, etc at an early age. It's quite possible that most of us see the non-primary colours (purple, teal, lime, rust etc) in the same ways, but we categorise them differently, by matching them in our heads to the set of colours we first learned names for.
I knew a guy who was red/green colour- blind, and saw both of these in a brownish way. He had once caused some mirth in his family by saying that something was "green, like a rabbit", so "rabbit-green" had been added to the family vocabulary.