Cassiterite
fashion jewelry gemstones may be brown or black and have an extremely high refractive index, giving them remarkable fire and dispersion, as well as an attractive adamantine or submetallic luster. Though
Wedding Rings cassiterite is mostly a collector's stone, it is hard enough to be used for jewelry.Chocolate opal is a translucent to opaque opal variety from
Diamond Jewelry Ethiopia that forms within layers.