***ZERO (0) COST IS NOT SALE PRICE AS PAR CLIENT DEMAND PRICE VARIATION***RATE AS PAR MARKET IMAGE ONLY FOR IDEA blue sapphire is a variety of the mineral **Corundum**. Corundum is a crystalline form of **Aluminum Oxide** ($\text{Al}_{2}\text{O}_{3}$). Pure corundum is colorless; the captivating blue color is caused primarily by the presence of trace elements **Iron (Fe)** and **Titanium (Ti)**.