I'm not sure. Does that quail always lay them this way? I've heard they can lay weird eggs and can have a line but I haven't heard of a blue line. What is the color inside of the egg? Many people think if the inside of the egg is blue than they have a celedon gene. I believe it because I have some that do and some that don't and we bought them from a local breeder that I also bought celedon from.
Would you be able to post a picture? Later I can find the Silverhomestead blog that shows coturnix quail eggs with lines and other things.