The one definite male I see in the picture is a Blue Diamond. A likely male I see is a Cobalt, therefore has Blue Diamond genetics. My experience with breeding BD's is that they take the longest to mature. Two years old or older is quite typical to breed this strain. In fact, my earliest successes were achieved by buying BD's that others have given up on and just waiting. Pigeon Blood strains, such as that orange one always out of the picture, would pair off earlier.