It's all comb, wattles, and behavior at the stated age.
Color and size of comb and wattles still say pullet. But it can still be early, so I would watch for sudden development over the next few weeks.
Pointy make specific saddle and hackle feathers won't start showing before 10-12 weeks of age in most non hen feathered breeds, making them irrelevant for now. They should be well visible by 16 weeks.
Saphire Gem are sex linked according to the following article..
https://cs-tf.com/sapphire-gem-chicken/
"Because the Sapphire Gem is a sex-linked breed, it is usually easy to
identify male and female chicks by the color of their feathers shortly after they hatch. In similarity to a black sex link breed, female Sapphire Gem chicks tend to be a solid blue color while male chicks tend to show a white spot on their heads or on the wings."
I did see another thread that indicated Hoover's might not be breeding them correctly for the sex linking.
But all signs currently point to pullet!