The creation of a natural colour diamond is nothing short of a miracle. In addition to the extreme conditions that must be present for a diamond to form inside the Earth, minute amounts of trace elements must also interact with the carbon atoms to permanently alter the colour.Fancy Colour Diamonds are the most expensive because of their extreme rarity. For every 1,00,000 carats of diamonds mined, less than one carat will receive a Fancy Colour Grade.
In diamonds, rarity equals value. With diamonds in the normal range, value is based on the absence of colour, because colourless diamonds are the rarest. With fancy colour diamonds—the ones outside the normal colour range—the rarest and most valuable colours are saturated pinks, blues, and greens. In all cases, even very slight colour differences can have a big impact on value.
The 4Cs are used but the colour, including intensity of colour and hues, are considered the diamond’s most important attribute. Fancy coloured diamonds are found in 12 different colours with more than 90 secondary hues and nine intensity levels within the 234 colour combinations. Their rarity and beauty makes some of these diamonds worth well into the millions of dollars
Hue refers to the dominant colour of the stone, such as pink, blue, or yellow. There can also be modifiers, or tints, which impart more than one colour to a stone. For instance, a purplish-pink diamond indicates a stone with a principal pink hue and a slight purple tint. If no modifiers or tints exist in a stone, then the hue is said to be pure.
Tone refers to how much lightness or darkness a stone appears to retain. The range of tones goes from light to dark.
Saturation describes the strength or intensity of the hue. The saturation of light diamonds can vary from pastel to vivid and intense. Dark diamonds can range from dark to deep.
Natural Colored Diamonds have a history of steady appreciation. In 2008, when gold fell 30% and white diamonds dropped 20%, natural fancy colour diamonds did not fall rather had a small rise (3-4%) in appreciation. In the past 30 years, fancy colour diamonds have never depreciated in value. The fact the Fancy Colour Diamonds are more difficult to procure means that the prices of Fancy Colour diamonds will only go up.