Spain Girl Fashion Ruby Diamond Engagement Ring 173

Spain Girl Fashion Ruby Diamond Engagement Ring.   

By Farzana Aamir

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Rubies have a hardness of 9.0 on the Mohs scale of mineral hardness. Among the natural gems only moissanite and diamond are harder, with diamond having a Mohs hardness of 10.0 and moissonite falling somewhere in between corundum (ruby) and diamond in hardness

South Sudan Girl Fashion Ruby Diamond Engagement Ring 172

 South Sudan Girl Fashion Ruby Diamond Engagement Ring.   

By Farzana Aamir

Ruby is α-alumina (the most stable form of Al2O3) in which a small fraction of the aluminium3+ ions are replaced by chromium3+ ions. Each Cr3+ is surrounded octahedrally by six O2− ions.