I made this jewellery with cro-tatting hook and 2 thread balls. That is why it is possible to do a chain in 2 colours (like on second photo).
I used Anchor Aida cotton Tkt 10 and Swarovski beads.
It was my idea how to do it.
Beside you can find only a little information about cro-tatting. It is rarely used today.
I do my best to make a tutorial one day how to do my Glowing Eyes Jewellery.