Wow, this is a nice, NICE Universe marble!! Everything inside this one just rocks, from the two neat planets to the caged opal to the jaw-dropping star fields. The caged opal is actually a planetary cocoon - who knew that planets transformed from opal? Sort of like diamonds from coal I suppose, ha ha. I couldn't get the pictures to capture it well, but in hand, you can really see that opal shining inside of its fumed cocooon, lined with disco sparkle. Awesome marble, a real conversation piece for your collection!