There are chameleons in the biological world, and there are discolored gems among gems.
Gemstones show different colors under sunlight or light (light with surplus red light), which is called the color change effect of gems.
The chromium-containing golden emerald is green and blue-green in daylight, and appears violet or red in light, with significant color changes. The golden emerald with the color-changing effect is called alexandrite, which is expensive and is a high-end gem among gems.
The discoloration effect mostly occurs in gems containing chromium and vanadium, such as Colombian vanadium-containing sapphires, Thai green sapphires, chromium-containing magnesia garnets and artificial corundum from China and Norway, and artificial spinel alexandrite.
The color-changing effect of colored gemstones adds more mystery and interest to the gems. In addition to their rarity, natural color-changing gemstones are more precious, which is rare in jewelry customization. ดังนั้น, if you see alexandrite with your own eyes, it is a kind of luck.