18x13mm Blue Opalite synthetic opal Cabochon flat back gem stone 962x

This is Opalite which is a popular substitute for real opal at a fraction of the cost. These are man made, I am going to note that these are lighter then the picture, photos show the blue but they will appear fairly clear with a shifting blue tint. The smaller the opalite cabs... the lighter in color they are. So the 40x30mm is going to be darker then the 10x8mm . Please pay attention to the size of the item. We offer the same stones in a lot of sizes and it is easy to get the wrong size as the pictures all look similar. Size is listed in the product title in millimeters (mm)