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Brain Teaser 10-8-13

Which gemstone has the ability to change color? It appears green to bluish green in daylight, but red to purplish red under incandescent light.
Tuesday's Brain Teaser

Which gemstone has the ability to change color? It appears green to bluish green in daylight, but red to purplish red under incandescent light. 

A. Alexandrite
B. Bloodstone
C. Chalcedony
D. Danburite

Watch the video for more information on today's Brain Teaser.
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