Alexandrite is #8.5 on Mohs scale and has excellent toughness. Sources are Brazil, East Africa, Russia, and Sri Lanka. Alexandrite is a rare chrysoberyl variety with chameleon like qualities. Its color is a lovely green in daylight or fluorescent light, but it changes to brownish or purplish red in the incandescent light from a lamp …
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On Valentine's Dat 2014 I had my second bad experience buying diamonds and decided to do something about it. I thought there should be a way to calculate exactly how much a diamond is worth at a jewelry store vs. online jewelry store vs. Craigslist.
