The disclosure is generally related to writing instruments capable of making markings containing large diameter glitter pigment particles, and glitter ink compositions for the same. In one embodiment, the disclosure provides a capillary-action marker comprising a glitter ink composition comprising glitter pigment particles having a particle size greater than about 12.1 microns in at least one dimension and at least one solvent, a low density ink reservoir for storing the glitter ink composition, and a porous nib in fluid communication with the low density ink reservoir.