Intense-Cornflower Blue Sapphire is the most classic and prestigious variety of blue sapphire, characterized by a pure, medium-intense blue with an exceptional velvety effect. This unique blue shade is most associated with legendary Kashmir sapphires and embodies timeless elegance and absolute luxury. Cornflower Blue represents the ultimate ideal of beauty and purity in the sapphire world.
9硬度（满分10）
Corundum所属矿物族
Standard Heat TreatmentHigh-temperature heat treatment (1600-1800°C) is applied to over 95% of Cornflower Blue Sapphires. This permanent process improves color by dissolving rutile inclusions and achieving the ideal Cornflower color balance. Widely accepted in the market, it must nonetheless be mentioned in gemological certificates.
Untreated / NaturalUntreated Cornflower Blue Sapphires are extremely rare (less than 5% of the market) and highly prized by collectors. Their rarity and natural beauty give them significantly higher value, especially when naturally achieving the ideal Cornflower color. A prestigious laboratory certificate (GIA, GRS, SSEF, Gübelin) is essential to confirm the absence of treatment.
Beryllium DiffusionControversial treatment that introduces beryllium into the stone at high temperature to modify or intensify color. This treatment significantly affects value (70-90% reduction) and must be systematically disclosed. Detectable by specialized laboratory analysis.
