Diamond Education: Color
When determining a diamond’s value, jewelers often refer to the 4Cs: cut, color, clarity, and carat.
Each of these four factors serves as the global standard for assessing and comparing diamond quality, and each plays a unique role in the overall beauty and value of the stone.
Whether you’re shopping for a classic engagement ring or a timeless piece of fine jewelry, understanding the 4Cs will empower you to make an informed decision. In this article, we’ll focus on one of the most visually impactful aspects of a diamond—its color.
A Comprehensive Guide: The GIA Color Scale
The Gemological Institute of America, or GIA, has formulated a color-grading scale to help describe a given diamond’s color and hue. Diamond color can be categorized into one of six categories. At the top of the scale are colorless diamonds, and at the bottom are Light Yellow; the presence of yellow hues within a diamond gets more pronounced as a stone progresses down the scale.
Colorless (D, E, F): As the name suggests, these diamonds are completely devoid of color. At this scale, the only way to differentiate a set of diamond’s colors from each other is by using a colorimeter. Engineered to detect the amount of light passing through a stone, this tool allows colorless diamonds to be graded in the absence of visible color.
Near Colorless (G – J): Near Colorless diamonds are assigned a grade G through J and possess slight yellow hues, setting them apart from D, E, and F grades. Due to their subtle tint of color, Near Colorless diamonds are less valuable than their completely colorless counterparts. Nonetheless, this tint is often undetectable to the untrained eye, making them an excellent choice for those seeking beauty and value
Faint Yellow (K, L, M): K, L, and M grade diamonds have an easily visible yellowish hue. The color is by no means pronounced, making Faint Yellow diamonds more affordable without great sacrifices to quality.
Very Light Yellow (N-R): Diamonds considered Very Light Yellow have slightly more visible color becoming increasingly prominent moving from N to R. R-grades have more pronounced yellow and brown hues.
Light Yellow (S – Z): Light Yellow diamonds have the most amount of yellow and brown. The hues are easily visible to the naked eye.
Special Grade: Beyond the grade of Z lies the realm of “fancy colored” diamonds. These stones have very pronounced hues, the most common being yellow, brown, and pink. There are also the pinks, blues, reds, oranges, and greens. These diamonds are considered “fancy” because they are incredibly rare. So much so, that only one out of every 10,000 carats of cut diamonds are bestowed the title of “fancy.” In line with general trends, fancy colored diamonds can be incredibly expensive due to their rarity.
Note that the reason the scale starts at D is because before the GIA existed, jewelers would grade diamonds at either A, B, or C
What causes Diamonds to Vary in Color?
The variations of colors that can be present in a diamond can be attributed to two main factors, namely the presence of trace elements and structural irregularities within a given stone.
Trace Elements
One of the most common causes of color variation in diamonds is the presence of trace elements. One such element in particular that causes coloration within a diamond is Nitrogen. Nitrogen atoms can replace carbon atoms within the diamond’s crystal lattice, causing the diamond to absorb blue light, which in turn makes the stone look yellow or even brown. The amount of nitrogen in the crystal structure directly influences the depth and intensity of the color. Given the commonality of nitrogen within diamonds, it’s no wonder then why the GIA’s color scheme is based upon yellow and brown hues.
Boron is another trace element responsible for causing coloration in diamonds. Whereas nitrogen can make a diamond have a yellow hue, boron can make a diamond have a blue hue. Blue diamonds are exceptionally rare and hold significant value due to their striking color and scarcity.
Structural Irregularities
Structural irregularities in the diamond’s crystal lattice also contribute to color formation. As diamonds are made under extreme pressure and temperature conditions deep within the Earth’s mantle, distortions, known as “plastic deformations,” can occur. These deformations alter the way light interacts with the diamond, and can lead to the creation of fancy-colored diamonds, such as pink, red, or brown. These color variations, caused by irregularities in the diamond’s structure, are rare, making pink and red diamonds especially coveted and expensive.
Which Factors Influence How We Perceive Diamond Color?
Whereas a diamond’s actual color is determined by trace elements and structural irregularities, its color can be perceived differently based upon other factors. Such factors include the diamond’s shape, color of the piece setting the diamond, cut quality, and the presence of blue fluorescence.
Shape
While the shape of the diamond plays a huge role in the overall look of a piece, it can also play a role in the color perception of a given stone. Light reflects differently on different shapes, giving shape direct influence over the stone’s hue. For instance, the round brilliant diamond, given its circular shape and faceting, gives off the most brilliance and light reflection of white light back towards the viewer. Emerald or Asscher-cut (square) diamonds, with their step-faceted design, have lower brilliance making the stone’s color harder to see.
Metal Color
The metal used in the setting can also have a big impact on how a diamond’s color is perceived. Generally speaking, the metal’s hue can reflect back upon the diamond, leading to different results depending on the diamond-metal combination.
A white diamond set in a yellow gold band may take on a warmer hue, as the yellow from the metal reflects onto the diamond, amplifying any subtle colors present within the stone. On the other hand, a white metal such as platinum or white gold provides a neutral backdrop, which can either maintain or even enhance the diamond’s whiteness.
For diamonds with a lower color grade (G or below), yellow or rose gold settings can help mask some of the stone’s warm color hues, creating an appearance where the stone compliments the metal. In contrast, colorless diamonds (D-F) are often best complemented by white metals, since they can let the diamond’s true brilliance and colorless appearance to shine without interference from surrounding metal hues.
When selecting the metal for your setting, consider how the interplay between metal color and diamond color will affect the overall appearance of your piece, ensuring the final result aligns with your desired aesthetic
Blue Fluorescence
One of the lesser-known aspects of color perception is blue fluorescence. This refers to the amount of blue light the diamond reflects under UV light. Since blue is opposite yellow on the color wheel, in theory, higher degrees of blue fluorescence can help cancel out any visible yellow tones.
With this theory in mind, some experts say that diamonds with high blue fluorescence can appear cloudy. This is by no means a rule of thumb, and we always advocate for seeing a diamond in person and seeking guidance from an expert to discuss such nuances as UV Fluorescence and color.
Final Thoughts: Picking Your Perfect Diamond Color
When choosing the perfect diamond, it’s essential to balance your personal aesthetic preferences with the diamond’s inherent color qualities. Whether you’re drawn to the brilliance of a colorless gem or the character of a warm-toned stone, understanding diamond color will guide you to a piece that truly reflects your style.
As important as color is though, it’s also important to consider all the characteristics of the diamond, including its cut, clarity, and carat. Each of these aspects plays an integral role in determining both the beauty and value of the stone.
If you’re in the market for a diamond, always remember to see a potential stone in person and consult with an expert to ensure you’re getting the right one, for your particular situation.
If you’re in the Dallas area, we warmly invite you to our studio, where we can help you navigate the world of diamonds to select the perfect stone.
With over 40 years of experience in crafting custom diamond pieces from scratch, our team of jewelers has assisted countless clients along their diamond journey.
Regardless if you’re looking for colorless diamonds to set on an old heirloom or are looking for fancy-colored diamonds for a unique piece, our team is sure to assist with transparency and confidence.