This Lovely Chatham Created Black Opal Gemstone Displays a Semi-translucent Medium to High Fire Shimmer That is Speckled With Blues Greens and Reds (as image shows). It has been faceted to a very high professional lapidary standard and have a very good make, polish and symmetry. It has a clarity rating of Eye Clean Plus (VS), meaning that it can have very minute inclusions that can only be seen with the aid of a microscope. All Chatham Created gemstones are accompanied by a Letter of Guarantee issued by Chatham that guarantees the gemstone against defects in the manufacturing process for the lifetime of the gemstone. Chatham gemstones have not undergone any treatment process. NOTE: Be sure to select the RIGHT gemstone/diamond by millimeter size only. Selecting your gemstone/diamond by carat weight is NOT ACCURATE. The best way to select the right size gemstone/diamond is to use our size chart image or consult with a local jeweler to measure your setting or gemstone Chatham Created Black Opal Trillion Trillion Chatham Created Black Opal Trillion shaped Chatham Created Black Opal GEM Chatham Created Black Opal is very similar and virtually identical in color, clarity and cut.