I've tried to write down a pattern for this necklace once it was done, (I use to work by sudden inspiration!).
I don't know if it's very clear, but you can make any question if you're confused on the pattern.:)
Hope you'll enjoy!

Less than one ball of any colour cotton yarn (worsted weight)
4.00mm hook

You can make more chains for each strand to have it longer.

no gauge

Necklace:
Ch77, sc in second ch from hook and in the next 3ch.
Ch76, sc in the 4th ch at the beg of previous ch loop, and in next 3chs, ch1, turn.
Sc in first sc and in next 3 sc, ch80, sc in the 4 sc at the beg of previous row, ch1, turn.
Sc in first sc and in next 3 sc, ch84, sc in the 4 sc at the beg of previous row, ch3 and sl st on the other side of the same closure piece to make a button hole.
Sew a button on the opposite closure piece of the button hole.
Make a flower of any kind (mines are just improvised!) to embellish the necklace, and sew it on the four chains strands.