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What makes Opal distinct is what is referred to as ‘play of color’
Due to its natural porosity
After the glass has cooled
It is a chalcedony believed to bring balance to the physical body while improving focus in the mind
A cryptocrystalline Chalcedony
Multi Spinel 3mm Faceted Round AA Grade - 15-16 Inch Puff Square What makes Opal distinct isSpinel is a hard vitreous magnesium aluminum oxide, and comes in a range of other colors, but those varieties are transparent. Black Spinel not only has the dark color, but it is opaque as well, rendering its black especially deep and mysterious. Sometimes called the "Black Prince's Ruby" for its role in the English crown. It has been mistaken for ruby and sapphire at times, but can be distinguished by its structure and its lower relative hardness.