Some info I found
The Sapphire Gem is a sex-linked chicken variety of chick, which means that their gender can be determined shortly after they hatch by observing their feathers’ colors.
Cross-breeding chickens cause this trait.
Another important note about the bedazzling beauties is that they...
I got this off Valley Farms hatchery page.
The Blue Sapphire (Sapphire Gem, Blue Plymouth Rock, etc.) is the cross of a Blue Plymouth Rock Male and a Barred Plymouth Rock Female. These chicks are color sexed at hatch. Males are blue with a white dot on their head and females are blue with no dot...