This unusual necklace been printed on a 3d printer using a plant based polymer called PLA. This particular polymer has wood fibres in it so the printed piece looks and feels like wood.
 
Dopamine is a neurotransmitter responsible for carrying information around the body to make the muscles move. It also has an effect of making you feel happy and is often released by feeling love, or being in love. It is also released under the influence of some drugs. A lack of dopamine is thought to be the cause of Parkinsons disease.