Yes, I agree with you... the magic oynx is going to be really harsh looking in my opinion.
I think the VA oynx is the best match. My opinion of course.
I will probably cave and get the WG VA oynx earrings too just to make a set. It doesn't have to look perfect, I am more about matchy matchy which then "makes" everything look perfect, even with a striped tee and shorts!
This is what I plan to do my next trip to VCA. I have already flown to VCA twice this year, and last time, they did not have a lot of inventory, so I will wait until they have all these pieces in stock. I will then go in and decide on my oynx set and get it over with (SA told me the SO is 6 month wait

).
For sure I will get WG 20 oynx. Then, to make my set...
For earrings, either:
- VA oynx (I will ask my SA to bring in that YG oynx set again to get a visual).
- Cosmos oynx
If I don't love the Cosmos earrings, I will just get the VA oynx and be done with it.
For my 3rd piece:
- If I love the Cosmos oynx earrings, I will get the Cosmos oynx BTF ring. It was off my list, but then I said to myself, why not? I don't hate it, and it may not be perfect, but it's so different and oynx and white metal is so Roaring 20s! I have the Tiffany black jade cabachon ring that is big, harsh, thick silver bevel, and I love that ring! So I'm now thinking, why not?
- If I do not love the Cosmos oynx earrings, then I will get an oynx bracelet. I will get either the 5 motif oynx or oynx pave. Oynx pave is really pretty, but... since I will already have the VA oynx and 20 motif oynx, I think I want the all oynx bracelet to make the perfect 3-piece matching set!
Speaking of the roaring 20s... we are now back in the roaring 20s!...
I love emerald, diamond, and oynx together. I plan to wear my emerald & diamond ring with my oynx set, so if you can imagine an emerald & diamond ring next to one harsh oynx 5 motif, and it doesn't quite work. The oynx pave bracelet adds a nice seque to the emerald and diamond ring which is what I am thinking. I also have matching earrings for my emerald & diamond ring, so I can wear the earrings on days I want more a pop of diamond, emeralds, and oynx. But... if I get the oynx pave bracelet, I lose my perfect 3 piece set! Such drama.
Whew, that was a long explanation, but you can see how I really think through how I want to wear my stuff before I dive in. Too mind draining, especially since I do not have a VCA near me hence this drags on and I need to wait.
You are so lucky you can try pieces on!
I hope this was helpful as you think through your set as welll. I would also consider any colored gemstones or bling pieces you have that are non-VCA. Oynx and pearl/MOP look great together too! Oh... and if you have any turquoise, turquoise and oynx are the bomb! I like that combo for jewelry a lot too.
We will have fun with this! Our oynx odsessy!