A 43-carat alexandrite in the collection of the British Museum ... You’ll still find estate jewelry set with some of the famed Ural Mountain alexandrites. They remain the quality standard for this ...
Alexandrite is relatively hard—8.5 on the Mohs scale. It has excellent toughness and no cleavage, which is a tendency to break when struck. This makes it a good choice for rings and other mountings ...
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