No, I don't think you can.
I think Sapphire Gems might be sexlinks, but I'm sure they are not autosexing. Autosexing breeds typically have white barring both sexes, while Sapphire Gem females seem to have no barring.
Sexlinks are a one-time cross where you can sex the chicks by color, but when those chicks grow up and produce chicks, you cannot color-sex that next generation.
