Turns out the Caribbean Onyx TWSBI Diamond 580ALR is quite close to the Prussian Blue. The CO is a skosh more green, the PB a smidge more blue, but not by a huge margin. The accents, including the nib, are darker/different as well. I like both, just expected a little more distinction, since it looked more green/teal in other photos.
In typical TWSBI stub fashion it shows off the shading in Rikka rather nicely.
[#]FountainPen #FountainPens
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