Carat boulder opal tablet - "Opal is known for its unique display of flashing rainbow colours called play-of-colour. There are two broad classes of opal: precious and common. Precious opal displays play-of-colour, common opal does not.
This fine Ethiopian opal measures in at 88 carats, a lucky number in the Chinese culture. It is very difficult to find clean rough in this size from the Ethiopian deposits, and this stone would be expensive simply for its quality and size in any case.
Largest Freeform Black Opal In The World Radiant with a rainbow of color and very close to twelve inches along the bottom, the huge carving weights Kg or carats, making it the largest free form black opal in the world.