In my experience of 40+ years of selling pearls the solution to this is to have three necks 18 24 and 32 inches or some combination
of length you like attached with the same spring ring (small) and you can wear all hooked together or singly or just two or any combination.
Keep the spring ring small and it can't be seen if that is your goal. One long all tied together gets cumbersome and can wear out the thread sooner with all the wrapping and playing needed. With any number of matching strands, for example, 18", 20", 22" etc your options are expanded.
Norm pearl-man