You will ask someone expert.So if I do blue roo over sapphire gem hen it will produce blue, black or splash right?
You can also check the chicken genetics calculator.
Bear in mind that some of the sapphire gems have a barred rock as a mother while others have a rhodebar as a mother.
You can't know.
And I repeat, they are hybrid layers for keeping, they are not for breeding. If you want to breed,you need a marathon runner heritage breed, not a speeder hybrid.