I will say this chick is 100% a cockerel. If not barred he would be a Production Blue most likely. Depending on the source (not a hatchery), he could be second generation. The sex linking is lost at that point and they're just considered a mix rather than a Sapphire Gem. That being said, assuming your other chicks look like the pullet pictured, it seems to me that they were sexed at a young age so I assume they're from a hatchery and not a backyard bred second generation. The barring in Sapphire Gems is often pretty muted looking. You can post more pics of it to see but it's difficult to discern in young birds in my experience on this forum. It tends to become more evident in the male sex-specific feathering on the saddle area in particular