The Two Sisters Met

Both Amelia and Sean knew why Samuel asked them to hide this matter.

After all, they have enjoyed the talisman and had seen the bloody battles due to these talismans. Just the cool talisman alone had caused some people to break up their family' ties. 

How could it possible for others not to covet it if Riya came up with better ones?

Because of this, there were not many people who knew about Riya's ability.

Riya had only shown it to a few people, who were her close friends.

Amelia also hadn't told Victoria about this matter because in her opinion, it might be a bit dangerous for her to spread this matter out through their chats. Who knew if someone could hack it?

So Amelia choose to wait.

Anyway, Ruby and Sophia knew because Riya showed her ability to them and when Victoria came, Riya might also show her.