Provide the eye colours of the heroes whose skin colours are gold.
skin colours are gold refers to colour.colour = 'Gold' WHERE skin_colour_id = colour.id;
SELECT T2.colour FROM superhero AS T1 INNER JOIN colour AS T2 ON T1.eye_colour_id = T2.id INNER JOIN colour AS T3 ON T1.skin_colour_id = T3.id WHERE T3.colour = 'Gold'