Robert Oster Green Diamond Fountain Pen Ink Sample

Try Robert Oster’s Green Diamond ink with this 2ml fountain pen ink sample.
Made in Australia and part of the Signature range, this ink offers reliable performance and vibrant expression for everyday writing or creative work.

Each sample contains approximately 2ml of ink, pre-filled into a labelled sample tube, making it perfect for testing color and flow before committing to a full bottle.

Looking for more? Browse all ink samples or shop bottled fountain pen inks.