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Also known as the Sapphire Blue Plymouth Rock or Blue Plymouth Rock, the Sapphire Gem is all the rage for novelty and specialty chicken fanciers. Scouring the internet for information on this rare variety will most likely lead you down a dead-end road or to the local jewelers’ websites. There is conflicting information on this variety of chicken, but one thing everyone seems to agree on is that this bird is a new favorite.
And I just found this, thanks to one of the posters who told us about the Blue D107
https://en.wikipedia.org/wiki/Dominant_CZ