Below are the different shops that are available in Destiny Child.
Here you can spend actual money to purchase various items. Some of them may have purchase limits.
This is Blood Gem shop where you can purchase various goods with blood gems. Everything has a purchase limit, it resets after one week.
Here you can spend your Rubmle coins to purchase various items. The shop resets every 3 hours. You can also spend 50 crystals to reset. To permanently increase the slots of available items to purchase requires gold.
The costume shop allows you to spend your Blood Gems on costumes.