What Is The Most Expensive Diamond Cut?

In the quest for the perfect diamond, enthusiasts often find themselves captivated by the beauty and brilliance that different cuts can offer. Yet, amidst the array of dazzling options, one cut stands out not only for its unparalleled sparkle but also for its distinction as the most expensive: the Round Brilliant Cut. 

At Plateau Jewelers, where elegance and expertise meet in the heart of Sammamish, WA, we pride ourselves on guiding our clients through the intricate world of diamonds. Let's dive into the facets of what makes the Round Brilliant Cut a jewel in the crown of the diamond industry and why it commands such a premium.

The Round Brilliant Cut: The Most Highly Valued Cut

In the world of diamonds, the cut not only influences the stone's overall appearance and brilliance but also significantly impacts its value. Among the various diamond cuts available, the Round Brilliant Cut stands as the most expensive. This preference for the Round Brilliant Cut stems from its unparalleled ability to maximize light reflection, creating exceptional sparkle and fire that is highly sought after by diamond enthusiasts.

Understanding Diamond Cuts

Before delving into why the Round Brilliant Cut commands higher prices, it's important to understand what is meant by "diamond cut." The cut of a diamond refers to how the stone is shaped and faceted from its rough form. It involves precise artistry and engineering to maximize the stone's optical properties, including its brilliance (the total light reflected from a diamond), fire (the dispersion of light into the colors of the spectrum), and scintillation (the sparkle when the diamond or light source is moved).

Evolution and Features of the Round Brilliant Cut

The Round Brilliant Cut is characterized by its 58 facets (including the culet and the table) arranged in a specific pattern designed to maximize light return through the top of the diamond. This cut has evolved over centuries, with contributions from various diamond cutters, but it was mathematician Marcel Tolkowsky's work in 1919 that defined its ideal proportions, balancing maximum brilliance and fire without sacrificing too much carat weight.

Reasons for Higher Cost

1. Waste of Rough Material

Creating a Round Brilliant Cut diamond results in a higher loss of rough material compared to other cuts. On average, cutting and polishing a round diamond may result in a loss of 50-60% of the rough stone's weight. This significant loss means that more rough diamond is needed to produce a finished round diamond of a specific size, contributing to its higher price.

2. Popularity and Demand

The Round Brilliant Cut is the most popular diamond shape for engagement rings and other fine jewelry. Its unmatched sparkle and timeless appeal drive high demand, which in turn increases its market value. The cut's versatility and classic look make it a favorite choice, maintaining its status as a premium option among consumers.

3. Cutting Precision and Skill

Achieving the Round Brilliant Cut's ideal proportions requires a high level of precision and skill from the diamond cutter. The process is both time-consuming and labor-intensive, factors that contribute to the final cost of the diamond. The expertise involved in cutting a Round Brilliant diamond to maximize its optical performance is a significant factor in its premium pricing.

4. Grading Premiums

Round Brilliant Cut diamonds often achieve higher grades on the cut quality scale, which is a critical factor in determining a diamond's value. A well-cut Round Brilliant diamond will display superior brilliance and fire, making it more desirable and, consequently, more expensive than diamonds of other cuts with similar color, clarity, and carat weight.


While the Round Brilliant Cut is the most expensive diamond cut due to its high demand, exceptional brilliance, and the craftsmanship required to produce it, its timeless beauty and unparalleled sparkle make it a worthwhile investment.

At Plateau Jewelers, we understand the significance of choosing the perfect diamond, and our experts are here to help you navigate the splendor of the Round Brilliant Cut, along with a myriad of other exquisite options. Whether you're looking to invest in this timeless piece or explore other luxurious cuts, we invite you to visit us in Sammamish, WA, or reach out to discover how we can illuminate your jewelry journey. Let's make your diamond dreams a dazzling reality.