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1-Cut2-Carat3-Clarity4-Colour

DIAMOND COLOUR

Most all natural diamonds contain small quantities of nitrogen atoms that displacing the carbon atoms within the crystal's lattice structure. These nitrogen impurities are evenly dispersed throughout the stone, absorbing some of the blue spectrum, thereby making the diamond appear yellow. The higher the amount of nitrogen atoms, the yellower the stone will appear.

In determining the color rating of a diamond, the Gemological Institute of America uses a scale of "D" to "Z" in which "D" is totally colorless and "Z" is yellow. The color chart in IMG 1 explains the GIA grading system for clear

(not fancy-colored) stones.

Diamond colour chart

Due to a diamond's high brilliance, and dispersion of light (fire) when looking through the table or crown, colour grading should be determined by examining the stone through the side of the pavilion (IMG 2), and not by looking at the top of the stone, as in (IMG 3) example below. Colour grading by 'visual-observation is performed against a Master CZ Coloured Grading Set

Diamond tint chart pavillion

diamond tint chart top

Skin Tone and Settings

While some may prefer a very transparent D to F range, others may prefer a "warmer" color found in a G to J range to compliment their skin tone. In some settings with various combinations of other stones, diamonds with a visible tint may be preferred.

FANCY COLOUR DIAMONDS

Diamonds can occur in all colours of the spectrum, and their colour is due to trace impurities of nitrogen and/or hydrogen (yellow, brown diamonds), boron (blue diamonds), radiation exposure (green diamonds) or irregular growth patterns within the crystal (pink, red diamonds).

Colourless diamonds would normally be priced much higher than yellow diamonds. However, when a diamond's colour is more intense than the "Z" grading, it enters the realm of a "Fancy Colour" diamond. In this case, the intensity of the colour in the diamond can plays a significant role in its value. The value of a Fancy Colour Diamond can surpass that of colourless diamonds if the intensity of the colour is high and the colour is rare.

Fancy Yellow Diamonds

(Canary Yellow)

Fancy yellow diamonds owe their colour the presence of nitrogen impurities which absorb the blue end of the colour spectrum. The GIA grades fancy diamond colour by quantifying the saturation, hue, and value (darkness) using nine classifications ranging from 'Faint' to 'Vivid.'

Pink Diamonds

The pink colour within these rare diamonds is due to irregular crystal growth patterns, causing microscopic imperfections within the lattice structure. One of the world's only major sources for rare pink diamonds is the Argyle Mine in Australia. Pink diamonds are similar to pink sapphire in colour, yet considerably more expensive.

Yellow Diamonds
Pink Diamond

Chameleon Diamonds

There is a very rare olive-grayish colour-changing diamond called "Chameleon Diamond" , which changes hue from grayish-blue or olive-green to yellowish-green or straw-yellow under different lighting conditions (darkness, bright light), lighting colour temperatures (incandescent, halogen, daylight) and ambient temperature changes.

Green Diamonds

Green diamonds owe their hue to millions of years of exposure to naturally occurring gamma and/or neutron radiation, and are typically found in alluvial secondary deposits. Primary sources are in south-central Africa. Most 'green' diamonds are actually a yellowish-green, greyish-green, or a combination of the two.

chameleon diamond

Green Diamonds

Blue Diamonds

They are extremely rare. They generally have a slight hint of gray, so they’re rarely as highly saturated as blue sapphires. Their color is caused by the presence of boron impurities—the more boron, the deeper the blue.

The Elusive Red Diamond

Perhaps the rarest diamond colour of all is the elusive Red Diamond. There are fewer than twenty known specimens of "natural" red diamond. The first red diamond to be found was the 1 carat 'Halphen Red,' discovered during the 18th century.

Blue Diamonds

Red Diamond

Fancy Coloured Synthetic Diamonds

Unlike natural diamond which can occur in completely colourless D, E, F grades, most synthetic diamonds will have a slightly yellowish hue due to nitrogen impurities that are dispersed throughout the crystal lattice structure during the growth phase. These impurities absorb the blue end of the light spectrum, making the stone appear yellowish. It is for this reason that manufacturers of synthetic diamonds tend to specialize in fancy colours.


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