With fancy colour diamonds, the rarest, most valuable colours are saturated pinks, blues and greens. Even very slight colour differences can have a big impact on value.
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What to look for
Compared to fancy yellows and browns, diamonds with a noticeable hint of any other hue are considerably more rare. Grading fancy colour diamonds is complex and specialised, and it takes highly trained laboratory graders to complete the process accurately.
Colour is the dominant value factor. Even diamonds with numerous inclusions that result in a low clarity grade are prized by connoisseurs if they display attractive face-up colour. Of course, inclusions that threaten the gem’s durability can lower a fancy-coloured diamond’s value significantly.
Cutters have discovered that certain styles—typically mixed cuts like the radiant—can intensify yellow colour in diamonds that are towards the lower end of the D-to-Z colour-grading scale. When carefully fashioned as radiant cuts, many yellow-tinted stones can become fancy yellows when viewed face up.