Spinel

In mineralogy, spinel classifies a whole group of realted minerals, only a dew are of gemstone quality, and are the ones Roosik & Co selected for this jewels. The coloring agents are iron, chromium, vanadium and cobalt. Large stones are rare.

Color: Violet, purple, red, orange
Moh's hardness: 8 
Chemical composition:MgAl2O4 Mangesium aluminium oxide

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