A blue sapphire is a precious gemstone made of the mineral corundum, prized for its deep blue color, exceptional durability, and rich history. 

Gemological Properties

• Mineral Family: Corundum (Al₂O₃), aluminum oxide.

• Color Source: The blue color comes from trace elements of titanium and iron.

• Hardness: Scores 9 on the Mohs scale, making it the third-hardest natural mineral after diamond and moissanite.

• Lustre: Vitreous (glass-like).

• Sources: Found primarily in Sri Lanka (Ceylon), Myanmar (Burma), Madagascar, Kashmir, and Australia