The pictures on this page show the typical differences of the eye cere in male and female Diamond Doves. These pictures are presented as an aid and as stated in my article; factors, such as being kept indoors, can affect what the cere may look like.
The above two birds are BLUE White Rumped Diamonds. Both birds are 8 months old. Note the "thickening" of the male's eye cere.
The birds in this picture and the picture below are of 3 month old Blue White-rump Diamond Doves. They are nestmates. The male is the top bird and the female is the bottom bird. Both are kept in a flight. This flight measures 3 feet wide, 8 feet tall and 12 feet long.
female on left & male on right
Flight Breeding Article