Sapphire

Deep blue is the colour most often associated with sapphire although this precious stone can also be found with pink, green and even yellow-orange tones, and Roosik & Co collection mix all of them. This is the hardest mineral after the diamond and, together with diamonds, rubies and emeralds, is one of the four most important precious stones in the world. 

Color: Blue in various tones, colorless, pink, orange, yellow, green, black, purple  
Moh's hardness: 9 
Chemical composition:Al2O3 Aluminium oxide

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