Dip a pastry brush in the honey and paint a line down one side of 4 tumblers. Sprinkle some edible gold glitter over the honey, dust off any excess, then put the glasses in the fridge.
Chop the coriander leaves and place in a cocktail shaker with the lime juice, 100ml pineapple juice and a handful of ice. Shake together until the outside of the shaker feels cold. Strain into the glasses, add extra ice cubes and divide 650ml pineapple juice and the tonic water between the glasses.