The Necklace

Areola and Ariana Martinez are identical twin sisters living with their divorced mother in a small town, Murrayfield.
They are both completely opposite from one another, although they live under the same roof but they barely associate with each other, and in school, it's like they're two different people.
So what happens when a necklace is passed down to Areola by her Abuela and Ariana wants it to herself and would do anything to get it?