incorporating LED to jewelry can add the elements of surprise and the uniqueness of the design. However, there might be the risk of making the jewelry into Halloween costume decoration. The design and the choice o color is very important.

last access 15th Oct 2016

image source: http://www.tuvie.com/lux-fashion-green-technology/
last access 15th Oct 2016

last access 15th Oct 2016
take note above us a self-construct simple LED jewelry kit, which means it is possible to hide everything at the back of such a small piece of jewelry.
AND
of course the amazing Zac Posen dress that stunned everyone(with and without light) at MET gala 2016:

last access 15th Oct 2016

image source: http://www.huffingtonpost.ca/2016/05/03/claire-danes-met-gala-2016_n_9829132.html
last access 15th Oct 2016
https://youtu.be/GBmS-4ZeTUw from youtube channel ViewPoint Visuals post on 2nd May 2016
Alternative of LED would be luminous(glow in the dark) materials which does not need electricity. We have seen it during concert, Halloweens, Christmas, etc.

last access 15th Oct 2016

last access 15th Oct 2016

last access 15th Oct 2016

last access 15th Oct 2016

last access 15th Oct 2016

last access 15th Oct 2016

last access 15th Oct 2016
The magic behind this?:
quote from Boredpanda.com:
“The secret to her magical touch? Richard applies luminous phosphorescent paint to each piece, which creates a turquoise glow when ‘charged’. The phosphorescent paint is charged by being held under a lamp for a few minutes or in the sun for a few hours.”
If this paint can be used, it solves the problem of hiding battery and wire, reducing the bulkiness of the product, and the lighting parts can be more specifically chosen and drawn.