Created in a laboratory, a nano crystal's chemical composition is a mixture of oxides and silicates grown within a glass matrix. Synthetic crystal is available in virtually all the colors of the rainbow, meaning the possibilities for jewelry design are endless. We say the color is homogenous, meaning that its shade and saturation does not vary from stone to stone. Some stones are also created to display various optical effects usually associated with natural gemstones, such as opalescence, an optical play of color phenomenon you can see occur naturally in opals.