1. Check Reviews: Do an online search to read reviews from past customers to ensure you're buying from a trustworthy merchant. 

2. Verify Return Policies: Make sure the merchant has an acceptable return policy should you want to return the item for any reason. 

3. Inspect Items Carefully: When you receive your artificial jewellery, inspect it carefully to ensure it looks as advertised. 

4. Check If Allergic Reactions Are Possible: Artificial jewellery can contain materials such as nickel, which may cause allergic reactions in some people.

5. Compare Prices: Prices for artificial jewellery can vary drastically between different merchants, so compare prices to get the best deal.