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  • Hardness - the measurement of resistance to permanent deformations.
    On the Mohs hardness scale, the hardness of a diamond is a 10, the hardest rating of all.
  • Heart Cut See Shape.
  • HPHT - High Pressure High Temperature treatment process. See Color Enhancement.
  • HRD - Belgian-based certification lab.
  • Hue the basic impression of a color; the aspect that gives color its identity.
    In colored diamonds, a lab might give a diamond one or two or three color grades. For example, a diamond might be a fancy yellowish, brownish orange. The latter color is the most dominant hue and the one that affects the value the most.