The Importance of GIA Diamond Grading

When you submit your items for consignment at Fortuna, our jewelry experts will give you their best assessment as to what your piece would fetch at auction; there are many factors to consider, such as condition, age, provenance, quality, current market conditions, and rarity. After our primary assessment, we will then discuss with you the possibility of submitting your items for certification at the Gemological Institute of America (GIA).

Why GIA?

Even if you’re not in the diamond industry, you’re probably familiar with the 4 C’s of diamond grading: Color, Clarity, Cut, and Carat Weight. These are objective values of a diamond’s characteristics used to determine the value of a diamond. This now internationally adopted metric was created by GIA, as such, they continue to be the most trusted diamond graders in the industry.

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yellow diamond

Yellow Diamonds: Differences in Grades & Value

Many buyers associate diamonds with icy, colorless clarity, but in fact, diamonds can come in many colors, including pink and blue. One color that has seen some popularity in recent years is the yellow diamond.

Yellow diamonds, sometimes called canary diamonds, are always created by one of two things — the color may be either introduced artificially or found in nature. Natural yellow diamonds get their color from the presence of nitrogen molecules.


Is a Yellow Diamond Rare?

White diamonds are graded from D to Z in terms of purity of color. As they get closer to Z, they take on a yellow hue due to imperfections and decrease in value. Once natural diamonds are completely out of this range, they can take on a deep, rich color and their beauty becomes sublime. These diamonds are referred to as “fancy colored.”

Only a small percentage of mined diamonds have a deep, true color. Of these, the majority are yellow. Therefore, while natural yellow diamonds are still very rare, they are much easier to find on the market compared to other fancy colored diamonds.

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diamond ring

What is the Worth of a Diamond?

Almost all diamonds share similar traits. They sparkle. They delight. They adorn. Yet, to a jewelry investor or a gemstone collector, each diamond has a specific value that transcends its natural beauty.

Auction consignors and their preferred auction houses must, therefore, determine the market value of every diamond. However, approximating a diamond’s likely selling point involves digging deeper into the diamond itself. Below are some of the factors that help indicate how much a diamond is worth within a national or global marketplace.

Evaluating the 4Cs of a Diamond

Most diamond owners or buyers have heard of the 4Cs: Cut, Clarity, Carat weight and Color. Gemologists and jewelers lean on these four factors to help them define a diamond.

Without the 4Cs, which were established nearly 70 years ago, diamonds would be challenging to differentiate objectively. The 4Cs provide a solid platform that everyone can agree upon. For instance, the color of a diamond has a strong impact on its worth. Usually, the closer to colorless a diamond is, the more highly it is prized. Therefore, a truly or practically clear diamond will have a better color grade than one with a yellowish tint. However, the color isn’t always bad. The general rule of thumb is, if a diamond is colored, the more intense the color the better.

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