Gemini Jewelry Necklace Made out of Chrysocolla and Black Jasper Gemstones with Pure Sterling Silver. This is a one of a kind, handmade, beautiful piece of jewelry. It is made with beautiful gemstones and pure 100 percent solid sterling silver. This rare piece appears to change color in different lighting and depending upon what you wear! Very neat! It can be adjusted to be a choker or a necklace depending upon your preference! I always have the option to adjust or even customize your own piece of jewelry.