mineralogy icon of aluminium oxide mineral corundum al2o3 from the mohs scale of mineral hardness on white.

al2o3 aluminium background beautiful beauty color corundum crystal crystalline dark decorative expensive gem gemmology gemology gemstone geological geology illustration isolated jewel jewelery jewelry luxury material mineral natural nature object oxide pebble pink precious purple raw red rock rough ruby semiprecious shadow shine shiny specimen stone structure surface texture textured treasure uncut vector violet white