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And alexandrite, the second of June's modern birthstones, "can be yellowish, brownish, grayish, or blueish green in daylight and orangy or brownish red to purple red in incandescent light ...
The alexandrite variety displays a color change dependent upon the nature of ambient lighting. Alexandrite results from small scale replacement of aluminium by chromium ions in the crystal structure, which causes intense absorption of light over a narrow range of wavelengths in the yellow region (520–620 nm ) [ 10 ] [ 11 ] of the visible ...
In 1912, to standardize birthstones, the (American) National Association of Jewelers (now called Jewelers of America) met in Kansas and officially adopted a list. [1]: 317 The Jewelry Industry Council of America updated the list in 1952 [3]: 311 by adding Alexandrite for June, citrine for November and pink tourmaline for October.
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Czochralski or “pulled” alexandrite is easier to identify because it is very “clean”. Curved striations visible with magnification are a give-away. Some pulled stones have been seen to change color from blue to red – similar to natural alexandrite from Brazil, Madagascar, and India.
Everything to know about the traditional and modern birthstones for May. Skip to main content. Sign in. Mail. 24/7 Help. For premium support please call: 800-290-4726 more ways to ...