Barred hen, splash rooster with no barring.
That will give blue sons with white barring and blue daughters with no white barring. The barring is visible as a light spot on the head at hatch.
Splash might come from Blue Andalusian, or Blue Australorp, or any other "blue" breed.
A patterned rooster can also work, as long as he has splash, and has no barring (for example, a Splash Laced Red Wyandotte would work fine.)
In all of those cases, the chicks will be blue and will be sexlinks (sexable by color at hatch), but they will not really be "Sapphire Gems." That name goes with one specific cross, from parent types that are not usually available to buy.