Rarity of hue, however, does not necessarily equal market desirability. Some colors of diamonds are more in demand.
Generally, desirability might fall into the following order:
Intense purple - resembles the color of amethyst
Intense green - with the emphasis being on "intense
Purple red - where undertones come into play
Purplish-red - this takes a better eye than mine
Bluish-green - not to be confused with irradiated diamonds
Greenish-blue - again, not irradiated
Pink - saturation plays a major role.
Blue - pure hues ex. Blue Heart and Hope Diamond
Orange - pure hue without undertones - think orange juice
Yellow - this would be highly saturated in the range of vivid
Cognac - generally larger stones & current fashion
Olive - Similar to Peridot
Gray - a case of rarity not equaling market desirability
Black - easy to confuse between natural and treated
Brown - pretty much the least favored colored diamond
Colored Diamonds
Colored Diamond Values