Gemstone Phenomena can be described as interesting or entertaining ways that light and color reflect in and out of gemstones, or special ways gemstones transmit and reflect light. Common phenomena in gemstones are stars or asterism, cat’s eye or chatoyancy, color change, play of color, iridescence, orient, adularescence, labradorescence and aventurescence. I will try to publish a page describing each phenomena and pictures if appropriate. We sell many phenomenal gemstones because they are fun and lend to many great stories. I will start with Opals, because we have seemed to sell more Opals the past few years.