Yellow sapphire is a variety of corundum prized for its warm color ranging from pale yellow to intense golden yellow. Its color is caused by traces of iron in the crystal structure.
9硬度（满分10）
Corundum所属矿物族
Heat TreatmentHeat treatment is very common and improves and intensifies the yellow color. This treatment is permanent and generally accepted in the market.
Untreated (Natural)Untreated yellow sapphires are rarer and command higher prices, especially for intense colors. They should be accompanied by a laboratory certificate.
Beryllium DiffusionLess common treatment that can intensify or modify the yellow color. Must be disclosed as it significantly affects value.
