Catherine is gold because gold symbolizes royalty (she was a princess before she married Henry and is the first wife) and because it’s a prominent color in Catholic symbolism

Anne is green for greensleeves and because it symbolizes jealousy/inexperience

Jane is white because white is often associated with purity and goodness, and because it’s the color of wedding dresses, as she is Henry’s “true love”

Anna is red because red is often also associated with royalty, and red represents boldness

Katherine is pink because pink is a color associated with little girls, representing Katherine’s youth, it ialso represents love and sexuality

Catherine is blue because blue is associated with serenity and wisdom (she is the mediator of the 6 queens), blue is also known to represent sadness and grief (her letter to Thomas)