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Arguably the most important part of picking a diamond is the shape of your lab diamond. Interestingly the shapes greatly influence the size of your lab diamond. This happens due to the facets and their placement. Asscher, emerald and princess cut make your stone look bigger even with a smaller carat weight while marquise and round typically require a heavier carat weight for a larger look. At Cuts & Carat, we’d like to help you choose the perfect lab diamond and thus explained below is not only each shape but also their weight in mm corresponding to the weight in carat.
Let’s learn about the various lab diamond shapes that are available in the market today and the ideal weight for each shape.
The round brilliant cut is perhaps the most iconic and classic of all man-made diamond shapes. Known for its exceptional brilliance and sparkle, this shape features 57 or 58 facets that are strategically designed to maximize the reflection and refraction of light. It's characterized by a circular shape with a pointed bottom (culet) and a flat top (table).
Why Choose It: The round brilliant cut is timeless and versatile, suitable for various jewelry styles, including engagement rings, pendants, and earrings. Its symmetrical design showcases the diamond's brilliance, making it a popular choice for those seeking a classic and dazzling look.
Conversion from carats to mm for Round Brilliant Cut
| Weight in mm | Weight in Carat |
|---|---|
| 0.8 mm. | 0.0025 ct. |
| 1 mm. | 0.005 ct. |
| 1.25 mm. | 0.01 ct. |
| 1.75 mm. | 0.02 ct. |
| 2 mm. | 0.03 ct. |
| 2.2 mm. | 0.04 ct. |
| 2.5 mm. | 0.06 ct. |
| 2.75 mm. | 0.08 ct. |
| 3 mm. | 0.10 ct. |
| 3.25 mm. | 0.14 ct. |
| 4 mm. | 0.25 ct. |
| 5.0 mm. | 0.50 ct. |
| 5.75 mm. | 0.75 ct. |
| 6.5 mm. | 1.00 ct. |
| 6.8 mm. | 1.25 ct. |
| 7.3 mm. | 1.50 ct. |
| 7.75 mm. | 1.75 ct. |
| 8 mm. | 2.00 ct. |
| 8.7 mm. | 2.50 ct. |
| 9.1 mm. | 3.00 ct. |
| 9.75 mm. | 3.50 ct. |
| 10.25 mm. | 4.00 ct. |
| 10.75 mm. | 4.50 ct. |
| 11 mm. | 5.00 ct. |
The princess cut is a square or rectangular-shaped lab grown diamond with pointed corners. It features sharp, uncut corners and a brilliant facet arrangement, typically with 76 facets. The princess cut combines the elegance of a square shape with the sparkle of a brilliant cut.
Why Choose It: Princess-cut lab-grown diamonds are known for their contemporary and modern appearance. They offer a unique blend of elegance and brilliance, making them a popular choice for engagement rings and other jewelry pieces.
Conversion from carats to mm for Princess Cut
| Weight in mm | Weight in Carat |
|---|---|
| 1.5 mm. | 0.015 ct. |
| 1.75 mm. | 0.03 ct. |
| 2 mm. | 0.06 ct. |
| 2.25 mm. | 0.08 ct. |
| 2.5 mm. | 0.10 ct. |
| 2.75 mm. | 0.13 ct. |
| 3 mm. | 0.18 ct. |
| 3.25 mm. | 0.25 ct. |
| 4.5 mm. | 0.50 ct. |
| 5 mm. | 0.75 ct. |
| 5.5 mm. | 1.00 ct. |
| 6 mm. | 1.25 ct. |
| 6.5 mm. | 1.50 ct. |
| 6.75 mm. | 1.75 ct. |
| 7 mm. | 2.00 ct. |
| 7.5 mm. | 2.50 ct. |
| 8 mm. | 3.00 ct. |
| 8.5 mm. | 3.50 ct. |
| 8.75 mm. | 4.00 ct. |
| 9.25 mm. | 4.50 ct. |
| 9.5 mm. | 5.00 ct. |
The emerald cut is a rectangular-shaped lab made diamond with cut corners. Unlike brilliant cuts, emerald cuts have step-cut facets, which create a hall-of-mirrors effect. This shape prioritizes clarity and showcases the lab diamond's internal characteristics.
Why Choose It: Emerald-cut lab-grown diamonds are favored for their sophisticated and vintage-inspired look. They exude elegance and are often chosen for engagement rings by those who appreciate understated beauty and clarity.
Conversion from carats to mm for Princess Cut
| Weight in mm | Weight in Carat |
|---|---|
| 3x2 mm. | 0.10 ct. |
| 3.5x2 mm. | 0.12 ct. |
| 4x2 mm. | 0.15 ct. |
| 4x3 mm. | 0.20 ct. |
| 4.30x3 mm. | 0.25 ct. |
| 6x4 mm. | 0.50 ct. |
| 6.5x4.5 mm. | 0.75 ct. |
| 7x5 mm. | 1.00 ct. |
| 7.3x5.3 mm. | 1.25 ct. |
| 7.5x5.5 mm. | 1.50 ct. |
| 8x6 mm. | 1.75 ct. |
| 8.5x6.5 mm. | 2.00 ct. |
| 9x7 mm. | 2.50 ct. |
| 9.3x7.5 mm. | 3.00 ct. |
| 9.75x7.7 mm. | 3.50 ct. |
| 10x8 mm. | 4.00 ct. |
| 10.5x8.5 mm. | 4.50 ct. |
| 11x9 mm. | 5.00 ct. |
Oval-cut lab grown diamonds are elongated and have an elliptical shape. They typically have 57 or 58 facets, similar to the round brilliant cut, which allows for excellent brilliance. Oval cuts create a unique and eye-catching appearance.
Why Choose It: Oval-cut lab-grown diamonds offer a classic yet distinctive look. They are an excellent choice for individuals who prefer a balance between traditional and unique designs. Oval shapes can make the fingers appear longer, which can be flattering when worn as an engagement ring.
Conversion from carats to mm for Oval Cut
| Weight in mm | Weight in Carat |
|---|---|
| 3.6x2.7 mm. | 0.10 ct. |
| 4x3 mm. | 0.15 ct. |
| 4.5x3.5 mm. | 0.20 ct. |
| 5x3 mm. | 0.25 ct. |
| 6x4 mm. | 0.50 ct. |
| 7x5 mm. | 0.75 ct. |
| 7.7x5.7 mm. | 1.00 ct. |
| 8x6 mm. | 1.25 ct. |
| 8.5x6.5 mm. | 1.50 ct. |
| 9x6.5 mm. | 1.75 ct. |
| 9x7 mm. | 2.00 ct. |
| 10x8 mm. | 2.50 ct. |
| 12x8 mm. | 3.00 ct. |
| 12x8.5 mm. | 3.50 ct. |
| 12.5x8.5 mm. | 4.00 ct. |
| 12.75x8.5 mm. | 4.50 ct. |
| 12x10 mm. | 5.00 ct. |
The radiant cut is a square or rectangular-shaped lab diamond with cut corners. It combines the elegance of the emerald cut with the brilliance of the round brilliant cut. Radiant cuts typically feature 70 facets.
Why Choose It: Radiant-cut lab-grown diamonds are known for their exceptional sparkle and versatility. They offer a perfect blend of elegance and brilliance, making them suitable for various jewelry styles, from engagement rings to earrings.
Conversion from carats to mm for Radiant Cut
| Weight in mm | Weight in Carat |
|---|---|
| 4.3x3 mm. | 0.25 ct. |
| 6x4 mm. | 0.50 ct. |
| 6.5x4.5 mm. | 0.75 ct. |
| 7x5 mm. | 1.00 ct. |
| 7.3x5.5 mm. | 1.25 ct. |
| 7.5x5.8 mm. | 1.50 ct. |
| 8x6 mm. | 1.75 ct. |
| 8.2x6.2 mm. | 2.00 ct. |
| 9x7 mm. | 2.50 ct. |
| 9.5x7.5 mm. | 3.00 ct. |
| 10x8 mm. | 3.50 ct. |
| 10.2x8.2 mm. | 4.00 ct. |
| 10.5x8.5 mm. | 4.50 ct. |
| 11x9 mm. | 5.00 ct. |
The cushion cut is characterized by its square or rectangular shape with rounded corners. It typically has 58 facets, which enhance its brilliance. The cushion cut resembles a pillow, hence its name.
Why Choose It: Cushion-cut lab-grown diamonds have a vintage and romantic appeal. They offer a soft, elegant appearance with excellent fire and brilliance. This shape is popular for engagement rings and other jewelry pieces that require a touch of nostalgia.
Conversion from carats to mm for Cushion Cut
| Weight in mm | Weight in Carat |
|---|---|
| 3.25 mm. | 0.25 ct. |
| 4.9 mm. | 0.50 ct. |
| 5.25 mm. | 0.75 ct. |
| 5.5 mm. | 1.00 ct. |
| 6 mm. | 1.25 ct. |
| 6.5 mm. | 1.50 ct. |
| 6.75 mm. | 1.75 ct. |
| 7 mm. | 2.00 ct. |
| 7.5 mm. | 2.50 ct. |
| 8 mm. | 3.00 ct. |
| 8.5 mm. | 3.50 ct. |
| 9 mm. | 4.00 ct. |
| 9.3 mm. | 4.50 ct. |
| 9.5 mm. | 5.00 ct. |
The pear cut, also known as the teardrop cut, combines the features of a round and marquise shape. It has a rounded end and a pointed end, creating a unique silhouette. Pear cuts typically have 58 facets.
Why Choose It: Pear-cut lab-grown diamonds are admired for their distinctiveness and versatility. They are often chosen for pendants and earrings, but they can also make stunning and unconventional engagement rings. The shape is associated with elegance and sophistication.
Conversion from carats to mm for Cushion Cut
| Weight in mm | Weight in Carat |
|---|---|
| 3x2 mm. | 0.13 ct. |
| 4x2.5 mm. | 0.18 ct. |
| 4x3 mm. | 0.21 ct. |
| 5x3 mm. | 0.25 ct. |
| 6x4 mm. | 0.50 ct. |
| 7x5 mm. | 0.75 ct. |
| 7.7x5.7 mm. | 1.00 ct. |
| 8x6 mm. | 1.25 ct. |
| 8.5x6.5 mm. | 1.50 ct. |
| 10x6 mm. | 1.75 ct. |
| 9x7 mm. | 2.00 ct. |
| 10x8 mm. | 2.50 ct. |
| 12x8 mm. | 3.00 ct. |
| 12x9 mm. | 3.50 ct. |
| 14x8 mm. | 4.00 ct. |
| 14.5x9 mm. | 4.50 ct. |
| 15x9 mm. | 5.00 ct. |
The marquise cut is an elongated man-made diamond shape with pointed ends. It typically has 58 facets, similar to the round brilliant cut. The marquise shape is often likened to a boat or football.
Why Choose It: Marquise-cut lab-grown diamonds are favored for their unique and elongating appearance. They create the illusion of longer fingers, making them a popular choice for engagement rings. This shape is distinctive and adds a touch of drama to jewelry designs.
Conversion from carats to mm for Marquise Cut
| Weight in mm | Weight in Carat |
|---|---|
| 3x1.5 mm. | 0.025 ct. |
| 3.5x2 mm. | 0.07 ct. |
| 4x2 mm. | 0.10 ct. |
| 4.25x2.25 mm. | 0.12 ct. |
| 5x2.5 mm. | 0.14 ct. |
| 5.5x2.75 mm. | 0.16 ct. |
| 5.5x3 mm. | 0.18 ct. |
| 5x3 mm. | 0.20 ct. |
| 6x3 mm. | 0.25 ct. |
| 8x4 mm. | 0.50 ct. |
| 9x4.5 mm. | 0.75 ct. |
| 10x5 mm. | 1.00 ct. |
| 11x5.5 mm. | 1.25 ct. |
| 12x6 mm. | 1.50 ct. |
| 12.5x6.25 mm. | 1.75 ct. |
| 13x6.5 mm. | 2.00 ct. |
| 14x7 mm. | 2.50 ct. |
| 15x7 mm. | 3.00 ct. |
| 15x8 mm. | 3.50 ct. |
| 16.5x8.25 mm. | 4.00 ct. |
| 16.75x8.5 mm. | 4.50 ct. |
| 17x8.5 mm. | 5.00 ct. |
The Asscher cut is a square-shaped lab diamond with cut corners. It features step-cut facets, similar to the emerald cut, which emphasize clarity and create a mesmerizing pattern of reflections.
Why Choose It: Asscher-cut lab-grown diamonds are known for their vintage and Art Deco charm. They offer a classic and geometric appearance that appeals to those with a taste for timeless elegance. Asscher cuts are often chosen for engagement rings and vintage-inspired jewelry.
Conversion from carats to mm for Asscher Cut
| Weight in mm | Weight in Carat |
|---|---|
| 3.25 mm. | 0.25 ct. |
| 4.5 mm. | 0.50 ct. |
| 5 mm. | 0.75 ct. |
| 5.5 mm. | 1.00 ct. |
| 6 mm. | 1.25 ct. |
| 6.5 mm. | 1.50 ct. |
| 6.7 mm. | 1.75 ct. |
| 7 mm. | 2.00 ct. |
| 7.5 mm. | 2.50 ct. |
| 8 mm. | 3.00 ct. |
| 8.5 mm. | 3.50 ct. |
| 9 mm. | 4.00 ct. |
| 9.25 mm. | 4.50 ct. |
| 9.5 mm. | 5.00 ct. |
The heart cut is a romantic and symbolic shape that resembles a heart. It typically has 59 facets, including a cleft at the top. Heart-shaped diamonds are crafted with precision to achieve a well-proportioned and symmetrical look.
Why Choose It: Heart-cut lab-grown diamonds are chosen for their symbolism and emotional significance. They are popular choices for engagement rings and pendants, symbolizing love and affection. The heart shape adds a sentimental touch to jewelry.
Conversion from carats to mm for Heart Cut
| Weight in mm | Weight in Carat |
|---|---|
| 3.5 mm. | 0.18 ct. |
| 4 mm. | 0.25 ct. |
| 5 mm. | 0.50 ct. |
| 6 mm. | 0.75 ct. |
| 6.5 mm. | 1.00 ct. |
| 7 mm. | 1.25 ct. |
| 7.5 mm. | 1.50 ct. |
| 7.7 mm. | 1.75 ct. |
| 8 mm. | 2.00 ct. |
| 8.5 mm. | 2.50 ct. |
| 9 mm. | 3.00 ct. |
| 10 mm. | 3.50 ct. |
| 10.5 mm. | 4.00 ct. |
| 11 mm. | 4.50 ct. |
| 11.5 mm. | 5.00 ct. |
The trillion cut, also known as the trilliant cut, is a triangular-shaped diamond with sharp, pointed corners. It typically has 31 or 50 facets, depending on whether it's a curved or straight-sided trillion. This shape maximizes brilliance and fire.
Why Choose It:Trillion-cut lab-grown diamonds are chosen for their striking and unconventional appearance. They are often used as accent stones in jewelry designs, such as three-stone engagement rings or as side stones in earrings.
The baguette cut is a slender, rectangular-shaped diamond with step-cut facets. It is typically used as accent stones in jewelry designs, such as alongside a larger center stone.
Why Choose It: Baguette-cut lab-grown diamonds are valued for their clean lines and ability to complement other diamond shapes. They add a touch of elegance and sophistication to jewelry settings, enhancing the overall design.
The kite cut is a diamond shape characterized by its resemblance to a kite, with a wide top and a pointed bottom. It is a unique and unconventional shape, often used for custom-designed jewelry.
This list, although extensive, is not exhaustive. Lab grown diamonds come in a variety of cuts, some of which catch on and others mere trends that die. These shapes are mostly custom made for clients but there’s a possibility of discovering them online. Here’s a tiny list of such interesting shapes;
Kite Cut: The kite cut resembles a kite with a wide top and a pointed bottom. It's an unconventional and unique shape, making it less common in traditional jewelry designs.
Octagonal Cut: This cut combines the elegance of the emerald cut with additional facets along the sides, creating a distinctive octagonal shape.
Hexagonal Cut: Hexagonal-cut lab diamonds have a six-sided shape that resembles a hexagon. They offer a geometric and symmetrical appearance with sharp angles, making them less common in traditional settings.
Mixed Cut: Mixed-cut lab grown diamonds combine elements of different cutting styles, such as brilliant and step cuts, to create a unique appearance. While not a single specific cut, mixed-cut diamonds offer variety and individuality.
Rose Cut: The rose cut is an antique-style cut with a flat bottom and a domed, faceted top that resembles the shape of a rosebud. It's not as commonly found in modern jewelry but has gained some popularity in vintage-inspired designs.
Custom Cut: Custom-cut diamonds are shaped according to unique and personalized designs, such as intricate patterns, symbols, or initials. These cuts are highly individualized and not mass-produced.
In conclusion, lab-grown diamonds offer a vast array of shapes and cuts, each with its own character and charm. The choice of diamond shape ultimately depends on personal preferences, style, and the intended use of the diamond in jewelry. Whether you gravitate toward the timeless elegance of a round brilliant cut or prefer the modern allure of a princess cut, there is a lab-grown diamond shape to suit every taste and occasion.
In Shirley Bassey’s words; “Diamonds are forever, forever, forever Diamonds are forever, forever, forever Forever and ever.” On this note, we hope you find your forever lab grown diamond at Cuts and Carats.
