Well, My (non-jewish) friend bought it for me as a gift, as she said to me: "I searched for Jewish necklace in Internet and looked for the most beautiful one I could find and bought this one for you". And I accepted, but explained to her that maybe I couldnt use it because its a symbol of Kabbalah and Im not an apprentice of it, despite following Judaism. She asked me to see with a rabbi of my "church" (she really knows nothing of Judaism) if I could use it and if it would have any negative meaning. I searched the Internet and really didnt find any negative meaning attached to this symbol and I have a lot of respect for Kabbalah and know some of Kabbalistic thought. But at the same time, being a Jew of a denomination more drawn towards Reform/New Orthodox Judaism, I found myself wondering if Kabbalah is something acceptable for these denominations and if I could use such a significant symbol. Finally, thank you in advance for reading my question and for the future answer.

ב"ה Shalom, I will make my answer very simple. The fact that the jewelers told your friend that the necklace has Kabbalistic meaning, shouldn't concern you at all. The necklace is not considered holy and does require you to do any religious obligations. To promote sales many jewelers may tell people that their jewelry has Kabbalistic meanings or that the precious stones have special qualities or they are stones from the priest's breast plate in order to convince customers to buy from them as they did to your friend who wanted to buy something Jewish for you. If you had bought the jewelry from a true Kabbalistic scholar who told you the necklace had all sorts of qualities, that would be another story. But to the best of my knowledge, I don't think there are Kabbalistic scholars who sell jewelry. Bottom line, thank your friend for thinking of you and enjoy your new necklace. All the best