Giant Rainbow Circuit Board NecklaceRainbow + circuit board = the most cheerfully geeky thing I could possibly make! Circuit board strips in red, orange, yellow, green, blue, and purple were arranged to create a mosaic y rainbow. The circuitry rests in a silver plated setting. Everything is covered in resin which provides protection and a beautiful finish. The pendant is pretty large at 1 1 2" (40 mm) tall. It has a bit of heft to it (35 g) but you won't notice that while wearing it. It