She used to call them Super Blue Egg Layers, and there are threads around here on the mix. I'm sure some folks bred them to each other. You should be able to fine the thread(s) and see their results.
Sapphire isn't a breed, it's simply a marketing term for a mixed breed high production blue egg layer.
Here's a great thread on white sport cream legbars. If you've hatched that many, I'd be letting the breeder know so they can cull appropriately if they desire...