Spinel
Red Spinel
Red spinel is a hard, brilliant magnesium-aluminium oxide gem that was mistaken for ruby for centuries. In Vedic tradition it is among the uparatnas for ruby, linked with the Sun.
Hardness 7.5–8Myanmar (Mogok)
Magnesium-aluminium oxide gems — red 'lal' spinel, long mistaken for ruby, and pink, blue and black spinels.