Hi! Congratulations, and you are on a roll with your pieces! My two cents...
A guilloche piece is all about the shiny reflection of sharply cut metal. That's the whole point and beauty of guilloche. I would stay with that theme and get the matching earrings. The VA pave earrings are nice, but to me, that VA pave look is more old-world glamour vs. guilloche which has a more contemporary sleek look. Hence, I would not mix the two next to your face. I personally like the earrings and necklace to match as the set will light up your face. The eye will go straight to your 10 motif, and then the eye will go to your ears and see the gorgeous matching earrings. Wow... it will pop!
On Frivole, I love love love Frivole. It is my favorite VCA collection. However, I do not think Frivole matches with Alhambra. They are two completely different looks; one is a flower and the other a quatrefoil. Yes, people wear the two together, probably because it's "VCA." However, take out the VCA brand. Pretend you're at Macy's or any dept store. You are looking at their jewelry cases... there is the case with a flower collection and another case with an quatrefoil collection. If these were two no name pieces, think if you would really pair them together and if you would like that look. I've tried pairing it together, and it just feels off to me. Yes, it's "VCA" but to me, the two designs do not complement each other. It's all preference of course, and jewelry is 100% personal tastes.
If you love Frivole and Alhambra together, go for it. All VCA pieces are gorgeous.
I personally think the guilloche would be fabulous, a very casual chic look. Plus, on the days you do not want to wear your 10 motif, these earrings would really shine on their own. Here is an enabling shot for you.

Just my two cents for another point of view. Hope this helps. Good luck in your decision!
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