The appearance of gemstones under various lighting conditions is primarily due to the way light interacts with the stone's internal structure and surface. This phenomenon is influenced by several factors: Refractive Index, Dispersion, Fluorescence, Surface and Cut. For example, high dispersion stones can show a spectrum of colors under certain lighting.
Types of Lighting- Sunlight (Natural Light): Sunlight provides a full spectrum of light, making it one of the best sources to view gemstones. It brings out the true colors and brilliance, especially in the morning and late afternoon when the light is softer.
- Fluorescent Light: This type of lighting emits a cooler, bluish light. It can sometimes make gemstones look less vibrant or even change their apparent color, making some stones appear more blue or green than they are.
- Incandescent Light: Emitting a warm, yellowish light, incandescent bulbs enhance the red, orange, and yellow tones in gemstones. This can make stones like rubies and garnets appear more vivid but might dull blue or green stones.
- LED Light: Modern LED lighting can vary widely in color temperature. High-quality LEDs can mimic natural light well, but cheaper versions may skew colors. They can enhance clarity and brilliance but might not always show the true color of the gemstone.
- Candlelight: This very warm light source can bring out the deep, rich tones in red and orange gemstones but might make cooler-toned stones look flat and less appealing.