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HRD
The
H
oge
R
aad vor
D
iamont is a prestigious independent European gemological grading laboratory based in Antwerp, Belgium that began grading diamonds and providing grading reports in 1976.
H Color
Near-colorless
. Color is slightly noticeable when compared to
colorless
diamonds.
Hardness
A gemstone resistance to scratches and abrasion.
Head
The part of a prong
mounting
into which the diamond is set.
Heart-shaped
A brilliant-cut fancy shaped heart diamond.
Hue
Hue is the basic color of a gemstone and one of the three dimensions used to describe color (see also
Saturation
,
Tone
).