A blue sapphire is a precious, highly durable gemstone made of aluminum oxide that belongs to the Gemological Institute of America (GIA) Corundum family.

Physical and Chemical Properties

• Composition: Aluminum oxide (Al₂O₃) with trace amounts of iron and titanium that create its iconic blue color.

• Hardness: Ranks 9 on the Mohs scale, making it second only to diamond in natural hardness and ideal for everyday jewelry