Buy for $5 from: https://www.youtube.com/channel/UCJFN4VZOLXKiAdvz9SwKD3w
These chain necklaces was built in Blender3d and it works well in the native .blend file. You can customize its shape on a bezier curve in blender.
Texture & Material:If you download the native .blend file, you'll get the material correctly but if you download the .obj or .fbx format, you need to download texture file as well and you should use the glitter normal map on your 3D object.