Those diamond shaped necklaces

When i was a starter in scene fashion i always saw that everyone had those necklaces and i had clearly no idea where did they buy them. I searched it up and i didnt even find ones you can buy, everyone made it diy. Since we dont have a 3d printer i tried making it from things i already had >> wires! I wasted 2 hours for making it cause the wires were too soft and always moved so the whole thing was chopped at the end, whatever i wore it for a few weeks. Then i realised that its a shame so i remade it from cardboard but it was too hard to cut the shape perfectly so it looked bad as well, lastly i tried making it from a thicker paper and it actually came out rlly cool but it was a windy week so it always moved left right when i was outside. Actually i have no further ideas of which material should i use but yeah hope smbd knows a shop or smth where they sell these