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Size:B: 250 Carats The Fantasia brand of Koroit Boulder Opal you are ordering is 100% natural and imported directly from Australia to Fantasia Mining's USA rock yard. Koroit boulder opal is formed in thin veins in matrix and is often called opal in matrix because of this. Sometimes the matrix has amazing patterns and other times it is more of a solid brown color depending on the area being mined. Your order will contain one or multiple pieces of this spectacular material of varying natural sizes, shapes and patterns as shown in the images which is equal to or greater than the weight purchased. VERY IMPORTANT: This listing is for a mine run grade of boulder opal rough. Some pieces in this listing have a lot of opal and other pieces are mostly or even possibly all matrix. In many cases the opal is hidden under the matrix and you will need to use a dremel or other tool to expose the colorful opal. Some pieces may have cut edges from the extraction process. All pictures were taken with the stones being wet and hydrated which helps to show the opals true colors and clarity. It will not have the same appearance when dry unless it has been polished, tumbled, or cabbed. HIGH GRADE AVAILABLE: If you want boulder opal where it has already been dremelled and the opal exposed instead of possibly getting a lot of matrix, the Fantasia brand of boulder opal hand cut slices offers a high grade precut and sorted material. Just search for "Fantasia Boulder Opal Hand Cut Slices" to see this high grade boulder opal from Fantasia here on . Metaphysical Properties: Boulder Opal is known to be a bridge between consciousnesses. It can help one understand their own subconscious desires, leading them toward progress. It can help aid in communication with other worldly beings including spirit and animal guides as well as other worldly intelligence. It aids in giving stability in one's life and providing a clear path and bridge toward advancement.