What is a Diamond Cut? Distinguishing Between Diamond Cut and Diamond Shape
Key Takeaways
- Diamond cut is not just a step in the manufacturing process, it is the key factor determining the beauty, brilliance, and true value of a diamond. A diamond with a standard cut...
Diamond cut is not just a step in the manufacturing process, it is the key factor determining the beauty, brilliance, and true value of a diamond. A diamond with a standard cut will reflect light perfectly, creating a radiant and captivating sparkle from every angle.
In the GIA's 4Cs standard, cut is the only factor created by human hands and is also the most easily overlooked when choosing a diamond. So, what is diamond cut, how many grades are there, and how does it affect aesthetics and investment value?
Jemmia notices that customers often confuse cut grade (Cut Grade) with cutting style (Cutting style, or Shape) of diamonds, while these are two completely different concepts in the diamond industry.
In this article, Jemmia's diamond experts will help you clearly distinguish between these two terms based on the international evaluation standards from the Gemological Institute of America (GIA). Through this, you will understand how to choose the most aesthetically beautiful diamond and the most suitable cutting style for yourself.
What is Diamond Cut?
Diamond Cut is how a diamond is faceted and shaped from its rough form, determining how light reflects through the stone. It is the most important factor in the GIA 4Cs standard affecting a diamond's brilliance and beauty.
The Gemological Institute of America (GIA) evaluates diamond cut based on three main technical factors:
- Proportions
- Symmetry
- Polish
A good cut creates the "fire" (colored flashes) and "brilliance" (sparkle) effects, while a poor cut can make a diamond look dull even if the stone quality is good.
Cut is the only factor in the 4Cs that is not dependent on nature, but is entirely determined by human hands.
Illustrative images of proportion factors affecting diamond cut quality:
The angles, depth, table size, and pavilion depth all play an important role in evaluating the quality of a diamond (Source: GIA Report)
GIA Standard Cut Scale
Round Brilliant diamonds are classified by GIA into 5 cut quality grades:
- Excellent Cut: The highest grade. Diamonds achieving this level reflect light almost perfectly, with maximum brightness, fire, and sparkle. This is the ideal choice for both aesthetics and investment.
- Very Good Cut: This grade indicates that light is still reflected effectively, with only a small amount of loss imperceptible to the naked eye. These diamonds still possess a brilliant beauty, suitable for users with high demands who want to optimize their budget.
- Good Cut: This grade represents a moderate level of finishing, where light reflection is uneven at some angles, causing a slight reduction in brightness and fire. However, the diamond still ensures basic aesthetics and is often used in popular jewelry lines.
- Fair Cut: This grade shows a noticeable loss of light due to suboptimal proportions or angles. The diamond may lack brilliance and vibrancy and is less favored in the high-end segment.
- Poor Cut: The lowest grade, indicating a sub-standard cut quality. Imbalanced proportions, cutting too deep or too shallow, cause light to leak out almost entirely, making the diamond appear dull and less reflective. Poor-grade diamonds are typically not used in high-end jewelry manufacturing.
What is Diamond Shape?
Let's explore the popular diamond cuts available in the market today with Jemmia:
- Round Cut (Most popular)
- Princess Cut
- Emerald Cut
- Asscher Cut
- Marquise Cut
- Oval Cut
- Radiant Cut
- Pear Cut
- Heart Cut
- Cushion Cut
Diamond Shape refers to the external form of a diamond after it has been cut from a rough stone, including its geometric proportions, outline, and cutting style.
This is a factor that expresses the overall beauty of the diamond in terms of its shape, not its technical quality like Cut Grade.
Explore the details of 10 popular diamond shapes on the market today:
- Round Cut: Has a total of 58 facets on the crown, girdle, and pavilion. It has the highest ability to reflect light and brilliance.
- Princess Cut: Frequently used in wedding ring designs. After completion, approximately 60% of the rough weight is maintained.
- Emerald Cut: Rectangular facets arranged in a stepped structure. Diamonds cut in this style often reveal inclusions.
- Asscher Cut: A stepped structure of square facets. The highest quality Asscher cut diamonds allow a square to be seen through the facets from the center.
- Marquise Cut: The shape of the cut diamond resembles a grain of rice. Light reflection creates great attraction.
- Oval Cut: This cut was developed from the round cut. The diamond will appear larger than its actual size due to its facets scattering light.
- Radiant Cut: The final shape of the cut diamond is a rectangle without sharp corners. Less rough diamond is used compared to other cuts.
- Pear Cut: One of the more difficult cuts, requiring very high standards from the jeweler. The diamond has two symmetrical parts along its main axis.
- Heart Cut: Exquisite facets, sparkling light. The heart-shaped diamond is often used in wedding jewelry.
- Cushion Cut: Numerous small facets combine to create a unique diamond. Its light reflection is ranked among the top.
Which diamond cut is the most beautiful?
Among all the cut grades recognized by the Gemological Institute of America (GIA), the "Excellent" grade is considered the most beautiful and valuable.
So, why is an Excellent diamond cut the most beautiful? According to GIA documentation that Jemmia has referenced, there are 3 reasons why an Excellent cut is the most beautiful:
1. Optimized Light Performance: Diamonds cut to Excellent grade have near-perfect proportions, angles, and symmetry. As a result, light entering the diamond is maximally reflected outwards, creating intense brilliance and vibrant fire. These are the two key elements of a beautiful diamond.
2. Superior Visual Effect: The wearer can easily perceive the dynamism as the diamond catches light from all angles, especially when moving in natural light or under artificial light.
3. High Investment Value: Diamonds with an Excellent cut are significantly more expensive than other grades (Very Good, Good...), and are prioritized by collectors and investors due to their rarity and good value retention.
Excellent Diamond Cut
Which diamond shape is the most beautiful?
Choosing the most beautiful diamond shape depends on many factors: personal aesthetic taste, intended use, and the visual effect each shape creates. Each diamond shape possesses its own unique beauty and style.
Technically, the Gemological Institute of America (GIA) does not grade "beautiful shapes," but only evaluates the cut.
However, according to market assessment and trends, the shapes that are popular and highly regarded aesthetically include: Round, Oval, and Heart.
Each diamond shape has its own unique beauty and style
Why does Jemmia only sell GIA diamonds with the highest standard cut: Excellent?
- Excellent Cut
- Excellent Symmetry
- Excellent Polish
3 Excellent Diamond Cut Standards at Jemmia
- At lower grades like Very Good or Good, light can leak or be dispersed unevenly. This causes the diamond to lose some of its inherent brilliance, affecting the visual experience.
- Two diamonds of the same carat, color, and clarity but with different cuts will offer entirely different experiences and values. An Excellent diamond may cost 20-30% more, but in return, it guarantees a true value commensurate with the customer's investment.
- Only about 3-5% of global diamonds achieve an Excellent cut according to GIA. This is a scarce segment with the best potential for value retention and appreciation. Jemmia's meticulously selected GIA diamonds have global value, ensuring a stable asset for customers.
