Well, based on what you wrote... I say return it and here is why:
- Yes, people will think it's a knockoff design or even a fake. You rarely see Pure, it's not popular, and the all gold Pure design is not iconic. If this point bothers you, return it.
- You speak of the bracelet that you have loved for years, yet you went with this necklace. The necklace seems to an impulse purchase. Perhaps you bought it because it was used and within your budget to get a "necklace", thinking you would get more bang for the buck vs. a new bracelet. Maybe I am wrong, but think about why you bought this bracelet when you've been dreaming of the bracelet. For me, I would only buy what I love, and I stick to my list.
- If you plan to collect other VA pieces, I would for sure return and get VA pieces. My gut feels says you may tire of this Pure all gold after a while, especially if you plan to get other Vintage Alhambra pieces.
If you poo poo-d what I wrote above and say no way, I love this necklace, then yes, you do... keep it!
For me, VCA is too expensive to settle or impulse buy based on getting a good deal for something you may not love. In the end, it's what you love, regardless of other's opinions, including mine. Jewelry is 100% personal preference.
Good luck in your decision! I am sure you will dream of VCA! I dream of VCA at night too... I think of other pieces that will fit in my collection, and it's so much fun!