A sheet of black paper as background;
small holes in the paper lit with a strong rear light source;
plastic foil to give different colours to the pin-sized light points;
a secondary light source on the necklace.
Hey! Thanks for taking the time to show us just how you did this. I doubt if I would have thought of it or even known how to set it up if I had! This is an example of the "extras" that really impress the voters. Thanks again snd BTW, I always appreciate the kind comments you leave under my images. I value sincere appraisals like your's! shu