I think it’s wafer paper because it looks quite thin. You have to use oil based colours for wafer paper. Water based gel colours will disintegrate the wafer paper.
-- Creativity is God's gift to us. Using our creativity is our gift back to God. Clarky's Cakes 😎
It could also be rice paper (Vietnamese Spring Roll Wrappers), formed and dry brushed with gold dusts. Another way to do it would be gum paste or pastillage, tinted to a mustard color and finished by dry brushing with gold luster dust.
-- Sugar Sugar by SSmiley