Here I review an ink by Diamine, by the title of "Emerald" (such a genuine Emerald-color, and not troublesome). Here-in may be found my own thoughts and opinions on the matter, as well as some test results I have for (among other factors) water-resistance on Clairefontaine, Rhodia, Copier Paper, Mead Notebook Paper, Tomoe River Paper, and Moleskine papers, and using a Hero 616 with a broad & wet nib, and another hero 616 with the standard nib (which is quite Fine) as pens for these tests/experiments.