How Do You Cut a Diamond?

The Journey of a Diamond: From Rough to Polished

The transformation of a rough diamond into a polished gemstone is one of the most remarkable journeys in the world of luxury. Diamonds begin their life deep within the Earth’s mantle, formed under extreme pressure and heat over billions of years. Once mined, these unassuming rough stones embark on a meticulous journey through the hands of skilled artisans.

A rough diamond bears little resemblance to the sparkling gems we see in diamond bangles or gold jewelry. They typically appear as translucent crystals with an oily or greasy luster. The cutting process involves removing up to 50-60% of the original rough diamond to reveal its inner beauty and brilliance.

The diamond cutting process has evolved significantly over centuries. While the fundamental principles remain the same, modern technology has enhanced precision and efficiency. From the ancient Indian diamond cutters who worked with rudimentary tools to today’s laser-equipped cutting facilities, the goal has always been to maximize a diamond’s natural properties: brilliance, fire, and scintillation.

At Jewels in Paradise, we appreciate the artistry behind every cut diamond in our collection, understanding that each represents countless hours of skilled craftsmanship and decision-making.

Diamond Assessment and Planning

Before any cutting begins, a rough diamond undergoes thorough assessment by specialized diamond planners or “markers.” This critical planning stage determines how to maximize the value of the rough stone while minimizing waste. The planner’s decisions will significantly impact the diamond’s final appearance, value, and even which luxury jewelry collection it might eventually grace.

Diamond planners use sophisticated 3D scanning technology to map the internal structure of the rough diamond, identifying inclusions, crystal planes, and grain directions. This mapping helps determine the optimal cutting approach. The planner must balance multiple factors:

• Maximizing carat weight retention
• Achieving ideal proportions for brilliance
• Working around inclusions and imperfections
• Determining the most profitable final cut (shape)

In some cases, a rough diamond might be cut into multiple smaller stones rather than one large gem. This decision depends on the stone’s natural shape, quality, and market demands. For instance, a large rough with significant inclusions might yield more value as several smaller, cleaner stones that could later be featured in designer jewelry pieces.

The planner marks the rough diamond with ink or thin lines to guide the cutter. These markings indicate where the first cuts should be made and provide a roadmap for the entire cutting process. This planning phase can take days or even weeks for exceptional diamonds, as even small miscalculations could cost millions in lost value.

Cleaving: The First Major Cut

Cleaving is often the first major step in shaping a rough diamond. This process involves splitting the rough diamond along its natural grain lines or cleavage planes. Much like splitting wood along its grain, diamond cleaving requires intimate knowledge of the stone’s internal structure.

Traditionally, cleaving was performed by striking a sharp blow to a steel blade positioned in a prepared notch on the diamond. This technique required extraordinary skill and nerves of steel – one wrong move could shatter a priceless stone. Today, laser cutting has largely replaced traditional cleaving for precision and safety, especially for stones destined for premium jewelry markets.

The cleaver’s goal is to separate the rough diamond into manageable pieces while removing major inclusions if possible. For larger rough diamonds, cleaving might be necessary to create workable pieces that can eventually become separate finished stones. In other cases, cleaving simply removes portions of the rough that cannot be incorporated into the final cut.

While modern technology has enhanced this process, human expertise remains essential. Master cleavers train for years to develop their skills and intuition. They understand that each diamond has its own “personality” and must be approached individually. This attention to detail ensures that diamonds destined for luxury jewelry stores maintain their maximum potential value.

Bruting: Creating the Diamond’s Shape

After cleaving, the diamond undergoes bruting (also called girdling), which establishes its basic shape. During this process, two diamonds are set on spinning axles and ground against each other to create the girdle – the widest part of the diamond that forms its outline when viewed from above.

Traditionally, bruting was entirely manual, with diamond cutters using their experienced eyes to judge the emerging shape. Today, laser bruting and computer-guided systems have largely automated this process for diamonds that will eventually be showcased in luxury watch bezels or high-end jewelry settings.

Bruting shapes the diamond into a cone, cylinder, or specific outline depending on the intended final cut. For the popular round brilliant cut, the stone takes on a perfect circle when viewed from above. For fancy shapes like oval, pear, or marquise cuts often featured in designer collections, the bruting process establishes these distinctive outlines.

This stage transforms the rough diamond fragment into a recognizable diamond shape, though still without its signature sparkle. The diamond takes on a frosted appearance, resembling sea glass, as its surface is covered with tiny scratches from the bruting process. These marks will later be removed during polishing, revealing the diamond’s true potential brilliance.

Faceting: Adding Brilliance and Fire

Faceting is where the magic truly happens in diamond cutting. This meticulous process involves cutting and polishing flat surfaces (facets) onto the diamond to create the geometric pattern that maximizes light return. The pattern of facets determines how light enters the stone, bounces around inside, and exits back to the viewer’s eye – creating the diamond’s signature sparkle that makes it perfect for luxury jewelry pieces.

A diamond cutter (also called a faceter) secures the stone in a specialized holder called a dop. Using a spinning wheel coated with diamond dust (the only material hard enough to cut another diamond), the faceter carefully grinds each facet at precise angles. The modern round brilliant cut, for example, features 58 facets – 33 on the top (crown), 24 on the bottom (pavilion), and the girdle.

Each facet must be cut at exact angles and proportions to maximize the diamond’s optical properties:

• Brilliance: The total light reflected from a diamond
• Fire: The dispersion of light into the colors of the spectrum
• Scintillation: The flashes of light and dark, or sparkle, when a diamond moves

The faceting process requires extraordinary precision. Even a half-degree error in angle can significantly reduce a diamond’s light performance and value. Master faceters train for years to develop the skill and judgment necessary to create diamonds worthy of prestigious jewelry settings.

While computer-guided faceting machines are now common, many high-value diamonds are still faceted partially or entirely by hand. Human judgment remains crucial for maximizing each unique stone’s potential, especially for diamonds destined for luxury men’s watches and fine jewelry.

Polishing: The Final Touch

The final stage in diamond cutting is polishing, which transforms the faceted stone from a dull, rough-surfaced object into the dazzling gem we recognize. This process removes any surface irregularities and gives each facet a mirror-like finish that allows light to enter and exit the diamond cleanly.

Diamond polishing is performed on a scaife – a horizontal spinning disc coated with diamond dust suspended in olive oil or another lubricant. The diamond is held against this wheel in a dop stick at precise angles to create perfectly smooth facets. Modern polishing may incorporate laser technology for exceptional precision, especially for diamonds destined for premium jewelry collections.

The polishing process requires extraordinary attention to detail. Polishers must ensure that each facet meets its neighboring facets at perfect junctions, creating sharp, straight edges between them. Any deviation will be visible in the finished stone and diminish its value and beauty.

After polishing, the diamond undergoes thorough cleaning to remove any remaining polishing compounds. It’s then inspected under magnification and with specialized optical equipment to verify its cut quality. Only when it meets strict standards for symmetry, proportion, and polish will it be ready to be set in exquisite jewelry or offered as a loose stone.

At Jewels in Paradise, we ensure that every diamond in our collection has undergone this meticulous polishing process to perfection, guaranteeing exceptional brilliance and fire.

Popular Diamond Cuts and Their Characteristics

Diamond cutting has evolved over centuries, with various cuts developed to highlight different aspects of a diamond’s beauty. Each cut has unique characteristics that appeal to different aesthetic preferences and can be found in various high-end jewelry collections:

• Round Brilliant Cut: The most popular and scientifically optimized cut, featuring 58 facets designed to maximize brilliance and fire. This versatile cut appears in everything from diamond bangles to engagement rings.
• Princess Cut: A square or rectangular cut with pointed corners, featuring numerous facets in a pattern that creates exceptional brilliance. This modern cut is popular in contemporary jewelry designs.
• Emerald Cut: A rectangular cut with stepped facets and cropped corners, creating a hall-of-mirrors effect rather than the sparkle of brilliant cuts. This elegant cut often appears in designer collections.
• Cushion Cut: Combining a square cut with rounded corners, this vintage-inspired cut offers exceptional fire and has seen a resurgence in modern luxury jewelry.
• Oval Cut: An elongated brilliant cut that can make fingers appear longer and slimmer. Its popularity in high-end jewelry stores continues to grow.
• Marquise Cut: A football-shaped cut with pointed ends, maximizing carat weight appearance and creating a dramatic look in statement pieces.
• Pear Cut: Combining round and marquise cuts into a teardrop shape, offering excellent brilliance and a unique appearance in luxury pendants and earrings.
• Radiant Cut: A rectangular or square cut with trimmed corners and brilliant-style facets, offering excellent brilliance for statement jewelry pieces.

Each cut presents different challenges to the diamond cutter and requires specific techniques to execute properly. The choice of cut is influenced by the rough diamond’s natural shape, the presence of inclusions, market preferences, and the artisan’s expertise. At Jewels in Paradise, we offer a diverse selection of cuts to suit every taste and occasion.

Modern Diamond Cutting Technology

While diamond cutting remains an art form, technology has revolutionized the