This necklace set by Twine and Twig is aptly named the neck party. It is a set of (I think) three separate pieces that you can opt to wear as shown below or individually (or with other similar items you may have).

They say, “The Twine & Twig Neck Party sets were carefully curated by owners Elizabeth and Jacquelyn to create the perfect layering look. All sets are made using globally source beads and natural materials. Each necklace can be worn individually or layered up. This Neck Party consists of: Long Classic Necklace | Gray, Mixed Metal Layer Necklace Set, Layered Classic Necklace | Gray. Twine & Twig jewelry may have slight variations and natural imperfections enhancing its raw, handcrafted look.”

This is sold as a set only and priced at USD$355.