thought about fishing lead free. Used some old/rusty nuts. then I wondered how someone could use a smooth stone as fishing weight, without drilling a hole in it. There are methods to set a jewelry stone in strings called makrameé. Actually quite easy once you get the hang of it.
>pic related
4 seperate pieces of 0,3 mm mono about 40 cm in length, layed double. you got 8 lines connecting one with the next one. looks somewhat sexy, does it not?