Black caviar was known in Russia long before oil, and may just be more deserving of the term 'black gold.' The history of black caviar is intertwined with wars, religion, commerce and environmental issues. 

Russian bracelets are measured in cm. 16 cm is approximately 6.3 inches.

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Agate is a rock consisting primarily of cryptocrystalline silica, chiefly chalcedony, alternating with microgranular quartz. It is characterized by its fineness of grain and variety of color