Material:

circuit diagram
wires
Gemma
NeoPixel Ring
tiny lipoly battery
solder wires
rope
loop wire
crystal

First, I soldered 3 the Neopixel and circuit diagram together.
Then I used USB to do the coding in adrino.
There is something wired happened this time. I tried everything l can by switching different computers and get help from the lab, the coding does not work. I can not upload the code to my neopixel ring somehow. The teacher from the lab assumed that probably my circuit was damaged by packaging or the way I soldered the wire might burned the circuit.

Then, I plugged the battery into my circuit and tied everything together with the necklace.

The way to make necklace:

Its so easy, I like to make little jewerys by myself. I got all material in China since its cheaper.
All I did was using the rope that has two loop wire on the side, then I wired a tiny loop wire on, then I used wire to wrap the crystal and wire crystal on the hoop.