This necklace would be more glittering in the evening.

Step 1: You Will Need

1 crochet hook
2 white color of yarn
3 chain
4 5mm LED (white)
5 LED cap (blue)
6 3V coin cell battery
7 vinyl tape

and scissors, needle..

Step 2: Tape the LED to the Battery

Tape the LED leads to the battery (the longer lead touching positive + and the shorter lead touching negative - of the battery ).
Keep the tape very tight.

Using the blue color of LED cap, necklace's light will be more subtle and when it's completed it looks like a Bluebird of Happiness!