IF
IF (Internally Flawless) diamonds are internally clean stones with no visible inclusions under 10× magnification. They may exhibit minor surface features detectable only by a skilled gemologist using specialized equipment. These characteristics do not affect the diamond’s optical performance and do not penetrate into the crystal. IF represents the second-highest clarity grade on the GIA (Gemological Institute of America) scale, just below FL (Flawless). Visually, IF diamonds are indistinguishable from FL stones.
In laboratory conditions, IF diamonds are grown using HPHT (High Pressure High Temperature) or CVD (Chemical Vapor Deposition) technologies. Gentle post-growth annealing may occasionally be applied to stabilize the color.