At first when she's still desperately trying to fit in with the cool kids it's hate to make that connection between her and that crystal. The reason for that is because it just stays as a "dud" as she calls it. She keeps trying, but as she starts to slowly see through the cool girls' guises and see them for the selfish liars they were the sapphire crystal slowly starts to grow into a beautiful blue gem like the rubies and alums did much earlier in the story. These other gems may symbolize some of the other characters in the story, but if that's the case then I didn't see who the gems correlated
At first when she's still desperately trying to fit in with the cool kids it's hate to make that connection between her and that crystal. The reason for that is because it just stays as a "dud" as she calls it. She keeps trying, but as she starts to slowly see through the cool girls' guises and see them for the selfish liars they were the sapphire crystal slowly starts to grow into a beautiful blue gem like the rubies and alums did much earlier in the story. These other gems may symbolize some of the other characters in the story, but if that's the case then I didn't see who the gems correlated