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Plotting is indicated in gemological reports for diamonds.

Александрит – разновидность минерала хризоберилл, изменяющая окраску в зависимости от характера освещения.

The concept of  "GRANATE" covers a wide range of minerals from different classes of mineralogical classification, united by a common structural motive of the structure of the crystal lattice.

Ruby is a type of corundum mineral colored with chromium ions in various shades of red.

An interesting fact is the name of the modern cut "Ashoka", created based on the old cut of a historic stone.