09/05/2025
Color-change sapphires are a unique variety of corundum that display different colors under various light sources, primarily due to the presence of trace elements like chromium and vanadium. They most commonly appear blue or violet in daylight and shift to a purple or reddish-purple hue under incandescent light. The intensity of this color change can be described as weak, moderate, or strong, influencing the stone's value.
Here's a more detailed explanation:
What causes the color change?
Trace elements:
The color change is attributed to the presence of trace elements like chromium and vanadium within the sapphire's crystal structure.
Light absorption:
These elements absorb specific wavelengths of light. Since different light sources have varying wavelength compositions, the color the sapphire appears changes when viewed under different lighting conditions.
Wavelength mix:
Under daylight, the sapphire absorbs less of the red and orange wavelengths, leading to a blue or violet appearance. In incandescent light, the mix of wavelengths is different, causing the sapphire to appear purple or reddish-purple.
Common color changes:
Blue to purple:
This is the most common color change, where the sapphire appears blue or violet under daylight and shifts to a purple or reddish-purple hue under incandescent light.
Green to reddish-brown:
Some rare color-change sapphires exhibit a change from green in daylight to reddish-brown under incandescent light.
Factors affecting the color change:
Lighting: The type of light source significantly impacts the observed color.
Color intensity: The strength of the color change can vary, with some sapphires showing a more pronounced shift than others.
Trace element concentration: The concentration of trace elements plays a role in the intensity and type of color change.
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