Pastel purple sapphire is a delicate variety of corundum displaying soft hues ranging from pale lavender to pinkish lilac. Its subtle and romantic color is caused by low concentrations of iron and titanium in its crystal structure.
9硬度（满分10）
Gentle Heat TreatmentGentle heat treatment improves color by removing unwanted secondary tones while preserving the delicacy of the pastel hue. This treatment is permanent and accepted in the market.
Untreated (Natural)Untreated pastel purple sapphires with pure color are rarer and typically command a price premium of 30 to 80% over heated stones of comparable quality. They should be accompanied by a certificate from a reputable laboratory (GIA, GRS, SSEF).
