Starstruck8 is correct. Over the years I have found that opal sellers are masters at manipulating light conditions to get the best out of an opal. While the opal may look like the photos in some light conditions, they often are disappointing in the most common light conditions encountered when wearing them. With this particular opal I would be concerned that in real life conditions it would be very transparent. The base looks quite clear. When this happens the color flashes become much less apparent. I have made mistakes in the past with purchasing stones like this when I was new to purchasing opals.