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The Hope ChrysoberylGlittering 45-carat chrysoberyl gemstone from Brazil which, has been known among gemmologists for about 170 years
Chrysoberyl cut stoneThis is Alexandrite, a cushion-shaped Chrysoberyl (beryllium aluminum oxide) gemstone. Alexandrite is named after the former czar of Russia, Alexander II
Alexandrite crystalsA cluster of the gemstone alexandrite trillings, or twinned crystals. This gemstone was named after the Russian Tsar Alexander II. It can appear in both red or green
Spinel specimenSpinel crystals from Vietnam. The rock has been chipped away to reveal the well-defined crystals
Magnetite (iron oxide) specimen from Piedmont, Italy. From the collections of the Natural History Museum, London
Spinel crystal and cut stoneSpinel (magnesium aluminium oxide) crystal from Ruby Mines, Mogok, Burma with spinel cut stone from Sri Lanka. Spinel is found in a red colour and has been previously mistaken for ruby
AlexandriteA twinned alexandrite crystal. Alexandrite is a variety of chrysoberyl (beryllium aluminum oxide) and is named after the former Czar of Russia, Alexander II