A Blue Tinted Beauty: Rare Carat Diamond Ring

Blue is one of the most sought-after diamond colors and one of the rarest. These blue gems, like the well-known Hope Diamond, will look stunning as centerpiece stones in any piece of jewelry. However, the majority of Blue Tint (Nuance) diamonds lack the saturation of top-grade blue sapphires and have grayish hues. Natural blue diamonds continue to command a premium, but treated and manufactured gems offer consumers a more reasonable alternative to these pricey collectibles. The four Cs of colorless diamonds are well-known to gem enthusiasts, but the quality factors of fancy blue diamonds are less well-known. Customers will have a better understanding of blue Rare Carat diamonds thanks to our buying guide.

The IGS colored diamond value listing includes price guidelines for irradiated blue diamonds. Fancy Colored Blue Diamond Buying and the Four Cs


 In contrast to colorless diamonds, where cut is more important than color, clarity, or carat, the value of a fancy colored blue diamond is primarily determined by its color. Gemstone color is made up of three main components: hue, tone, and saturation.

The primary color of a fancy blue Rare Carat diamonds is blue. Secondary hues of green or, less frequently, purple may be present. Gems with a greenish hue are more valuable than gems with a slight purple hue, despite the fact that neither is desirable. Nonetheless, greenish blue diamonds are less expensive than pure blue diamonds and make beautiful jewelry stones.

Tone is less important than hue and saturation when determining the value of a fancy blue diamond. Because they obscure the blue color, gems that are neither very light nor very dark fetch high prices. Gemstones, on the other hand, can be excellent in a wide range of tones in between.

High-saturation, untreated fancy blue Rare Carat diamonds, which are extremely uncommon, will command a premium price. The majority of blue diamonds have a greyish-blue appearance and low saturation.

Diamond Ring

What Constitutes “Fancy” Color?

Fancy Rare Carat diamonds are categorized as Faint, Very Light, Light, Fancy Light, Fancy, Fancy Dark, Fancy Deep, Fancy Intense, or Fancy Vivid by the Gemological Institute of America (GIA). The evaluation of the gem’s tone and saturation led to these designations. Examples of these designations can be seen in the colored diamond color reference chart from the GIA.

Gem graders rate nearly any Rare Carat diamond with a blue hue as Fancy Light or better because of the extremely low supply of blue Rare Carat diamonds. The majority of blue diamonds are “steely,” or very grey with a blue tint. The grayish gems then change from Fancy Light to Fancy or Fancy Dark as the tone gets darker.

Blue diamond ratings rise from Fancy to Fancy

Intense and Fancy Vivid with increasing saturation. Fancy Deep gems have darker tones and saturation levels ranging from medium to high. Medium to dark tones have the highest saturation for blue hues. The darkest fancy vivid diamonds and the most saturated fancy deep diamonds therefore have the best tone and saturation for blue stones on the GIA grading scale.


 Because natural blue diamonds are so uncommon, even the best specimens frequently have inclusions. Although small inclusions will not significantly affect clarity grading, inclusions that diminish a gem’s beauty or transparency will lower its value.

Even though the cut is the most important factor in the value of colorless diamonds, even blue diamonds with poor cut have a significant value. Cuts in natural and rare gems may be asymmetrical or feature large windows. Most importantly, blue Rare Carat diamonds should have their color enhanced by cutting. Although brilliant cuts are common for colorless diamonds due to their ability to increase brilliance, they can also diminish color.

Again, naturally occurring blue diamonds are extremely uncommon. As a result, when stones are larger in size, their price per carat quickly rises. Six figures are paid for a good-colored one carat natural gem.

Diamonds with a Blue Treatment

Some diamonds are treated with heat or irradiation to turn blue. These typically have high saturation and are much less expensive than their untreated counterparts. There is no need for additional care because these radiation and heat treatments are permanent.

To enhance the color of some Rare Carat diamonds, a blue substance may be applied to the surface. This coating may degrade over time, necessitating additional care.

Some diamonds undergo laser treatment to remove undesirable inclusions in order to enhance clarity. Additionally, fillings may be present in fractured diamonds to conceal the cracks.

These and other gem enhancements will always be noted in gemological laboratory reports.

Blue Rare Carat diamonds can be made at synthetic blue Rare Carat diamond laboratories. If you’re on a tight budget or prefer synthetic gems for ethical reasons, this is a great option.

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