Diamine x Niche Pens Alexandrite Fountain Pen Ink Sample (3mL)15th anniversary of selling pens, inks and stationery accessories on our two websites. We wanted to mark whats a special time for us with something that will be really, really special for you! We've named the ink 'Alexandrite' a 15th anniversary gemstone, with unique colour changing properties depending on the time of day. A deep teal in daytime light, to a rich red when the light starts to fade at dusk. Our ink, too, changes colour and sheens with