Hello, my friend. Firstly, we are pleased to have collaborated with you on a sample trial order. We have sent you a higher quality natural Lapis lazuli sample that you purchased from our company. We can 100% confirm and guarantee that these Lapis lazuli are pure natural. If you are unable to distinguish whether they are natural, you can contact our staff and we can provide you with a professional NGTC natural stone testing certificate. Alternatively, you can use them to find a local natural stone testing agency for gemstone testing and certification. Thank you very much.