Blue Opal Sphere (with stand) ce809202592053e9621b108fbc302a10 specimens such as this are

specimens such as this are highly collectible

Each strand measures 15 inches in length

Research shows that they adapted their diet over thousands of years

They then entered North America ~20 million years ago by means of the Bering Isthmus which was once a land mass connection between North America and Asia

tend to have legs that are wider and more connected to one another

Blue Opal Sphere (with stand) ce809202592053e9621b108fbc302a10 specimens such as this areOpal is composed of hydrated silica. It is an amorphous silicate, meaning it does not form crystals. Opals are structurally composed of tiny spheres of silica which, when arranged in perfect geometry, create the famous play of color associated with the stones. The symmetrical arrangement of silica balls acts like a prism, which allows the rainbow spectrum of colors to be visible to the naked eye.