Identification of the colour in the diamond, ranging from D to Z. In fantasy coloured diamonds, exactly the opposite happens; their value grows with the strength and intensity of colour from Z onwards.
Large stones with vivid colours are extremely rare. One diamond in ten thousand has a Fancy Colour. The rarest colours are red, green, pink and blue. The yellow and brown one follow close behind and, having a lower price than the others, they can more easily fulfil women’s desires. In Fancy Colour diamonds, the inclusions, or clarity, are overshadowed if the stone observed face-up presents an attractive colour. This is not the case if the durability of the stone is going to be compromised.
Usually Fantasy Diamonds are cut to maximize return of light. The best cut is the one that gives the most attractive colour when face up.
Fancy Diamonds are classified by increasing degree of intensity of colour: Faint, Very Light, Light, Fancy Light, Fancy to Fancy Intense, Fancy Vivid, Fancy Dark, Fancy Deep. These last two have higher prices. With the same characteristics of a colourless stone compared to a Light Yellow or Brown one it has more value. The question changes if it is a Fancy Deep.