It is those dresses or tops with an asymmetrical way, usually with just one strap or just one shoulder naked. They are great if you are a smart woman with a long neck, beautiful collarbones, and thin arms. If not, best avoid them because you do not do any favors.
If you’re one of those privileged, good for you, but I regret to say that you have a problem because perhaps it is the type of neckline more complicated to match a necklace.
The important thing is the proportion, make sure the collar is long enough to make it at least 5 cm above or below the neckline.
This neckline is by far the most difficult to match with a necklace so if I were you, I would go for a great pair of earrings! 😀