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.
Birthstones & AnniversariesDiamond 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.
The 45.52-carat Fancy Deep grayish blue Hope Diamond is the world’s most famous gem.
There are a number of processes used to alter the colour or apparent clarity, or to improve the durability of gems.Learn More
Some gemstones have synthetic counterparts that have essentially the same chemical, physical and optical properties, but are grown by man in a laboratory.Learn More
Any gem can be imitated – sometimes by man-made materials or by natural materials chosen by man to impersonate a particular gem.Learn More
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.
Strength and purity of colour influence a fancy colour diamond’s value.
The most valuable hues are pink, blue and green. Slight colour differences can impact value.
Even diamonds with a low clarity grade are prized by connoisseurs if their colour is attractive.
Fancy shapes like radiant cuts are commonly used to maximize the intensity of the colour.
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.
The Legendary Dresden Green DiamondRobert E. Kane, Shane R McClure and Joachim Menzhausen , Dec 1, 1990 Read more in English
Strongly Coloured Pink CVD Lab-Grown DiamondsWuyi Wang and Patrick Doering, Joshua Tower, Ren Lu, Sally Eaton-Magaña, Paul Johnson, Erica Emerson, and Thomas M. Moses , Mar 1, 2010 Read more in English
Possible “Sister” Stones of the Hope DiamondScott D. Sucher, Stephen W. Attaway, Nancy L. Attaway, and Jeffrey E. Post , Mar 1, 2010 Read more in English