Dichroic Glass was originally created for the space and laser industries, and was developed extensively by NASA. The word dichroic means "two colors" because of the two or more colors that the glass reflects and transmits. The glass is made with metallic oxides, mainly copper, silver and gold, and has properties of all of them. The necklace has three, 1 inch long, rectangular blue, framed, dichroic glass sections, with flecks of opalescent confetti inside. It is hard to see in these photos, but they are visible and look like a lighter version of the earrings. There are 2 sections of free form Biwa Pearls. They are all bezel set in silver frames, some decorated with wire scrollwork around the edges and a heart in wire at the bottom of the necklace. They are linked together and finished with shiny sterling chain and a lobster claw clasp. The necklace is 18 inches long. The earrings have teardrops of blue dichroic glass at the bottom, with brighter "confetti" than the necklace, then blue crystals and round moonstones at the top. Just over 2 inches (50 mm) long. I'm not sure of the percentage of sterling, but they will stay shiny if kept in a bag (like the one they all come in). Dichroic (pronounced "dye-crow-ick") glass, commonly called dichro for short, literally means "two colored." It is derived from the Greek words "di" for two, and "chroma" for color. It was thus named because of its fantastic multicolored and reflective properties. When you look at this glass, it appears to have more than one color at the same time, especially when viewed with different lighting. You can add more colors by using more layers. This reflective phenomenon is known as thin-film physics, which is also why you see swirling rainbow patterns in a soap bubble, floating colors from oil on water and the dramatic colors of dragonfly wings.