The Tiffany Victoria necklace in size medium fits this budget if you are into branded items. It is an incredibly wearable necklace. I have had mine for over 6 months now and I wear it 24 x 7. It is not an "in your face" type of necklace but I have gotten a lot of compliments on it.
Honestly, the diamond solitaire is nice I had one, but it gets lost. It just doesn't make the statement a tennis or riviera necklace makes. If you are leaning toward a necklace which is versatile but you are on the edge decision wise, why not consider a tennis necklace, the diamonds are all the same size. You can add or wear those alone just like you can a Riviera Necklace but I think they look a bit more subtle depending on the carat weight. Think about trying a tennis necklace too.
I bought a smaller weight tennis style because I did want something more subtle. I already had a 15" 5 ct. one in white metal so opted for a longer one of the same weight in yellow. It is very subtle. I purchased the YG from Deejays as well and am happy with the quality, and the cost was less than half of your budget, so you could go with larger stones. For me, it wasn't about budget but I wanted something that I would wear often and not only when I was dressed up a bit. A lot depends on your lifestyle I think. That will probably determine how much bling you can wear on your neck regularly. Here are photos of the two that I have. The white is a vintage piece.
If I remember correctly the stones are mounted on several small ‘bars’ so flipping/twisting would be minimal or non existent. It’s beautiful.
OP might be interested in looking at vintage pieces as well? I’ve not seen this style before.