Quality 20 inches in length 1.2mm 925 sterling silver "snake" chain and 925 sterling silver donut bail. The chain and bail are substantial enough to hold up to wear and tear and long enough for every neck size. The smooth chain allows the bail to slide easily.
Add any large 35-45mm gemstone donut you like to this and change it out for another in an instant. The donuts that I carry are approximately 40mm--about the size of a silver dollar.
Gemstone donuts are not included, but assortments are available.