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Fancy Colour Diamond

Dazzling brilliance. Captivating colour. The planet’s most valued gems are fancy colour diamonds.

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Radiant Cut

The radiant cutting style helps intensify a fancy coloured diamond’s colour.

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Beyond Z

Diamonds with more yellow than GIA’s Z grade are considered fancy colour.

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Colour is Value

Subtle colour differences impact the value of a fancy coloured diamond.

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Octahedral Form

Beautifully formed octahedrons might become collectors' treasures.

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Crystal Faces

Diamond crystal faces show cutters how to get the best weight retention.

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Uneven Colour

The colour in rough diamond might not be evenly distributed in the rough.

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About Fancy-coloured Diamond

Aurora Butterfly of Peace

Gem diamonds in GIA’s D-to-Z range usually decrease in value as the colour becomes more obvious. Just the opposite happens with fancy colour diamonds: Their value generally increases with the strength and purity of the colour. Large, vivid fancy colour diamonds are extremely rare and very valuable. However, many fancy diamond colours are muted rather than pure and strong.

Fancy Colour Diamond Description

Fancy Colour Diamond History and Lore

Birthstones & Anniversaries

Diamond is the birthstone for April and the gem of the 10th and 60th anniversaries. Fancy colour diamond adds a unique twist to your celebration.

1 in 10,000

Only one in 10,000 diamonds has a fancy colour.

$71.2 million (£57.1 million)

The Pink Star diamond,
59.60 carats, is the most expensive
gem ever auctioned.

Hope Diamond

The 45.52-carat Fancy Deep grayish blue Hope Diamond is the world’s most famous gem.


  • Mineral: Diamond


There are a number of processes used to alter the colour or apparent clarity, or to improve the durability of gems.

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Some gemstones have synthetic counterparts that have essentially the same chemical, physical and optical properties, but are grown by man in a laboratory.

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Any gem can be imitated – sometimes by man-made materials or by natural materials chosen by man to impersonate a particular gem.

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gem love

Why We Love This Gemstone

Rarest of the rare

Fancy colour diamonds are the rarest of the rare. Each is one of a kind.


Red diamonds are so rare that only a handful are known to exist.


Less than one boron atom per million of carbon atoms can give a diamond a blue colour.

Quality Factors

Strength and purity of colour influence a fancy colour diamond’s value.


quality factors

The most valuable hues are pink, blue and green. Slight colour differences can impact value.


quality factors

Even diamonds with a low clarity grade are prized by connoisseurs if their colour is attractive.


quality factors

Fancy shapes like radiant cuts are commonly used to maximize the intensity of the colour.

Carat Weight

quality factors

In pink, blue, green and orange, even fancy colour diamonds of less than a carat are rare and valuable.

Fancy Colour Diamond Quality Factors: The Comprehensive Guide


Explore sources, gemmological research and the role of gems in history.

A blue diamond with inclusions under the table is held up in tweezers.

Where Do Blue Diamonds Come From?

Blue Diamonds Have a Surprising “Superdeep” Origin and a Link to Ancient Oceans

Evan M. Smith , Aug 1, 2018 Read Article
G&G Winter 2018 Cover

Natural-Color Pink, Purple, Red, and Brown Diamonds: Band of Many Colors

Sally Eaton-Magaña, Troy Ardon, Karen V. Smit, Christopher M. Breeding, and James E. Shigley , Feb 1, 2019 Read more in English
Recently discovered and legendary diamonds in the blue/gray/violet color range

Natural-Color Blue, Gray, and Violet Diamonds: Allure of the Deep

Sally Eaton-Magaña, Christopher M. Breeding, and James E. Shigley , Aug 6, 2018 Read more in English

Very Large Irradiated Yellow Diamond

Wuyi Wang , Jan 30, 2015 Read more in English