Garnet as it comes out of the ground—already faceted by the crystal's own geometry

and Afghanistan

Its vivid yellow-green color is an intrinsic property of the iron in its crystal structure—the color is built into the mineral's chemistry and cannot be altered by any post-formation process

Pyrite is iron sulfide with a bright metallic cubic crystal structure

it ranges from translucent honey to deep cognac

Blue Opal Sterling Silver Pendant Sleep Garnet as it comes outA blue opal cabochon set in solid . 925 sterling silver. Opal is hydrated silicaa non crystalline mineraloid that can hold up to a fifth of its weight in water. This blue variety, much of it from the Andes of Peru, is a common opal: it carries a soft, milky blue green from traces of copper minerals rather than the flashing play of color of precious opal. The color runs evenly through the stone, cut and polished to a smooth domed cabochon and set in a