Why does my diamond ring turn a different color under black light?
No no, not at all. Many gemstones turn a different color under different types of light, particularly UV light (as you would encounter from a black light). This is a physical property called ‘fluorescence’ and is actually a characteristic diagnostic property of many gemstones (such as a blue glow in diamonds). In some gemstones it is very vivid, and in many others it is very dull or completely nonexistent.
