The 2020 Edelstein is Moonstone, a grey ink. For the first time they used a grey/silver cap instead of the usual black one to match the colour.
(And a matching Anthracite Stresemann)
I don't tend to like grey inks, especially the warm, dirty, muddy kind of grey (e.g. KWZI Grey Lux, J. Herbin Gris Orage). But sometimes I do enjoy some cold greys, like L'Artisan Pastellier Gris de Payne. I usually like greys that are more complex, like the original version of 3Oysters Doldam (long since reformulated) with its complex shades of yellow and blue.
Moonstone is one of those more complex ones that I like very much. It's a low-saturated cool grey. It writes down as a somewhat purplish grey but dries to a cooler tone. It shows a slightly yellow tint where the ink pools. Not as drastic as the aforementioned Doldam, but still very attractive. It has a lot of shading and halo-ing (dark outlines). It writes reasonably wet and smooth, and it's also mostly water-resistant.
(Pens: Pelikan M1005 Medium, Lamy 2000 Broad)
(with some other inks)
(with 18% grey card)
(freshly written vs dried)