Violet sapphire is a rare variety of corundum that combines the nobility of blue and the softness of pink in a captivating violet hue. This color is caused by traces of vanadium and iron in the crystal structure.
9硬度（满分10）
Heat TreatmentHeat treatment is very common (approximately 90% of violet sapphires on the market). It improves the uniformity and saturation of the violet color. This permanent treatment is generally accepted and must be disclosed.
Untreated (Natural)Untreated violet sapphires are rare and command significantly higher prices. They must be accompanied by a certificate from a recognized laboratory (GIA, GRS, SSEF) confirming the absence of treatment.
Diffusion TreatmentLess frequent treatment that modifies surface or deep color. Must absolutely be disclosed as it considerably affects value (70-90% reduction).
