Shimmer ink can be daunting to use in an expensive fountain pen. Enter the Lamy Safari. I will put shimmer ink like "Stars in Autumn" from Wearingeul in this pen no problem.

Shop Lamy Safari fountain pens here https://goldspot.com/collections/lamy...
Shop Lamy Safari Red and Blue Fountain Pen https://goldspot.com/products/lamysa...
Shop Wearingeul Ink https://goldspot.com/collections/wear...