3 Reasons Why Opals Turn Yellow (Plus How To Look After)
When opals lose water, they can begin to dry out, leading to a change in color. This dehydration can occur when an opal is exposed to extreme heat, low humidity, or even stored improperly over a long period of time. As the water evaporates from the opal's internal structure, the stone may start to exhibit a yellow, brown, or in more extreme ...