So curious about the white sapphires. You breed a cream crested legbar with a leghorn and get blue egg layers. What happens after that first generation?
Legbar x Leghorn = blue egg layer that has one blue egg gene and one white one. (O/o+)
If you breed two of those together, your odds would be 75% blue egg layers and 25 % white egg layer.
Your genetics would be:
25% O/O
50% O/o+
25% o+/o+