Flux-grown, pulled and hydrothermal synthetic sapphires can be very convincing substitutes for the natural gem. Color change synthetic sapphire, made to imitate alexandrite, has been popular since the ...
Infrared spectroscopy provides a means to distinguish natural from synthetic alexandrites in the range 2000-4200 cm -1, as determined by a study of spectra obtained from 15 natural and 28 synthetic ...
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What is the birthstone for June? It actually has three. A guide to the colorful gemsAlexandrite is a rare variety of mineral ... The animals form the gem as a natural defense to keep irritants – such as a parasite or grains of sand – from entering their shell, The Natural ...
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What color is my birthstone? Learn which gemstone represents each month and what it means.alexandrite and moonstone. Pearls are often white or cream but can come in other colors. Natural pearls are produced by mollusks. These animals form the gem as a natural defense against irritants ...
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