BE CAREFUL WITH LIGHT AND HEATJust as the sun’s harmful rays can damage our skin, light and heat can affect a colored gemstone’s durability and color. Over time, and in excess, they can also fade or damage some gemstones, such as amethyst, kunzite, topaz and shell cameos. Pearls and other delicate materials, such as ivory, will bleach under extreme exposure to light. Other gems, especially amber, can darken over time when exposed to too much light.
Excessive heat and sudden temperature changes may also fracture some gems. Heat can easily remove the natural moisture these gems need to keep their beauty. Pearls, for instance, can dry out, crack and discolor. Opals can turn white or brown, develop tiny cracks, and might lose their play-of-color.