White opal, akin to other types of opal, is comprised of a high percentage of water—often ranging from 3% to 21%. This high water content is what contributes to its unique play-of-color phenomenon. However, this water can also evaporate over time, especially in dry conditions, which can lead to a loss of iridescence or even cracking. For this reason, opal owners are advised to protect their stones from environments with extreme temperature changes or low humidity to maintain their stone’s captivating beauty.
