Alexandrite Color Change Light. Conventional wisdom among cutters has traditionally held that this favored color change is obtained if the table facet is oriented. How can you tell if a stone is alexandrite?
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However, alexandrite’s most impressive characteristic is the colors it displays. In sunlight, alexandrite has the color of emerald (emerald). The color changing property of alexandrite is known as ‘alexandrite effect’, and is a result of chromium traces found in the gemstone.
Alexandrites Change Colors Because Of A Unique And Rare Chemical Composition.
It causes intense absorption of light over a narrow range of wavelengths in the yellow region of the visible light spectrum. Alexandrite effect is the phenomenon of an observed color change from greenish to reddish with a change in source illumination due physiological response of the human eye in a particular part of the visible spectrum.daylight contains high proportions of blue and green light and incandescent lighting contains a higher balance of red light. In bright light, it should appear emerald green and in dim.
Chemically, Alexandrite Can Be Differentiated From Normal Chrysoberyl By The Presence Of Chromium.
The color change phenomena is a result of the presence of chromium +3 ions and the way they absorb and reflect light. This group of rocks includes the colorless or transparent yellow chrysoberyl. Alexandrite stone is an extremely rare mineral that has the ability to change color.
It Is Only Chrysoberyl Displaying Distinct Color Changes That Is Called Alexandrite.
According to science, alexandrite is basically a rock belonging to the chrysoberyl rock group (aluminum beryl mineral). The chromium traces cause strong light absorption in the yellow and blue parts of the spectrum. Alexandrite contains chromium, and it is this element that contributes to the startling color changes.
Chrysoberyl Contains Iron And Titanium.
The color changing property of alexandrite is known as ‘alexandrite effect’, and is a result of chromium traces found in the gemstone. Rarely are both colors bright and vivid and often stones that change to bright red under incandescent light are only brown or almost black in daylight. Conventional wisdom among cutters has traditionally held that this favored color change is obtained if the table facet is oriented.
In This Case, A Small Scale Change Of Aluminum Ions Alters Its Color.
Conversely, some of the nicest daylight blue green stones only change to faint pink under incandescent light. When the light is balanced (daylight), the stone is. When these aluminum ions are replaced by chromium ions, the crystal reacts differently to light absorption.
