Diamond had been to a Bormuga shop before, so she knew how much those people loved overpricing their clothes. If it wasn't for the fact that they knew how to make nice clothes, she wouldn't have bothered to enter the shop and shocked her sister that much.
However, that was something that she was planning to do. She needed Ruby to get used to that, as she didn't want her to be fooled by a scheming man when she went to school.
As she didn't have a lot of money back, then and was desperate to earn it big without working hard, Diamond suffered so much in a relationship that only brought her pain and humiliation in the end.
For the sake of a branded handbag, a fancy meal, and an expensive phone, Diamond went through a lot.
She didn't want Ruby to follow in her previous footsteps. If she were to be used to spending money like that, then even if a young man approached her for the wrong reasons, she wouldn't be fooled.
