Laboratory-grown marquise diamond

Discover our collection of marquise-cut lab-grown diamonds. Available in different sizes and colors to create a unique and elegant piece of jewelry.

Lab-grown marquise diamond

The marquise diamond is one of the most recognizable cuts in classic jewelry. Its elongated shape, with two sharp points at the ends and a curved belly in the center, resembles the bow of a ship or the corner of a smile.

This cut originated in 18th-century Europe and is now produced in laboratories with the same millimeter precision required by its unique geometry.

At Diamante de Laboratorio, we work exclusively with stones created using CVD and HPHT processes, technologies that replicate the exact conditions under which natural diamonds are formed.

The result is a physically identical stone, with the same hardness, refractive index, and chemical composition, but without the environmental impact or ethical concerns associated with conventional mining.

Why choose a laboratory-grown marquise diamond

The laboratory-grown marquise diamond offers a combination that is hard to beat: visually striking geometry, a completely traceable origin, and a significantly lower price than its natural equivalent.

The elongated cut visually slims the finger and makes the stone appear larger than it actually is.

For the same carat weight, a marquise occupies more visible surface area than a round or cushion cut, making it one of the most efficient cuts in terms of visual presence per carat.

Furthermore, because they are manufactured in a laboratory under controlled conditions, it is possible to produce marquise diamonds in fancy colors such as pink, blue, or yellow with a consistency difficult to find in nature.

How the marquise cut is created

The marquise cut requires extreme precision. Its 55-58 facets must be distributed perfectly symmetrically along the major axis of the stone.

Any deviation directly affects visual symmetry: if the points are not aligned or the belly is not uniform, the eye immediately perceives it.

The process begins with the selection of the rough crystal created in the laboratory. Subsequently, the lapidaries apply the faceting with tolerances of tenths of a millimeter.

The final result is evaluated under a 10x magnifying glass and documented in the IGI certificate, including the exact length, width, depth, and angles of the cut.

The 4Cs applied to the marquise diamond

Color in the marquise diamond

The marquise cut retains color more intensely at the points than in the center.

For those seeking a visually white appearance, D-E grades are recommended.

In fancy diamonds, this characteristic becomes an advantage, as color saturation is concentrated in the most visible areas.

Clarity in the marquise diamond

Inclusions near the center are usually less visible than in cuts like the emerald.

However, inclusions in the tips can be problematic due to the structural stress in those areas.

A minimum clarity of VVS2 is recommended to ensure an eye-clean and structurally safe stone.

Cut and proportions of the marquise

The ideal proportion for a marquise is between 1.75:1 and 2.25:1.

Stones that are too long and narrow can develop the well-known bowtie effect, a dark bow-shaped shadow caused by poor light reflection.

The IGI certificate helps identify this phenomenon by evaluating the cut.

Carats in the marquise diamond

Thanks to its elongated shape and large visible surface, a 0.80 ct marquise can appear visually similar to a 1.00 ct round diamond.

This makes the marquise one of the best options for maximizing visual impact without increasing the budget.

At Diamante de Laboratorio, we have marquise stones from 0.30 ct, all with IGI certification.

IGI certification for laboratory-grown marquise diamonds

All marquise stones in our collection include a certificate from the International Gemological Institute (IGI), the leading laboratory for lab-grown diamonds.

The report documents color, clarity, cut, carat weight, exact proportions, fluorescence, and the growth method used, whether CVD or HPHT.

Each certificate includes a unique number laser-engraved on the girdle of the stone, allowing its authenticity to be verified at any time.

How to choose your laboratory-grown marquise diamond

  • Length-to-width ratio: look for proportions between 1.85:1 and 2.10:1 for a classic visual balance.
  • Absence of bowtie: check that the cut has a Good, Very Good, or Excellent rating.
  • Clarity at the points: request high-resolution images to verify that the most delicate areas are clean.
  • Appropriate setting: use protective prongs at the tips to reduce the risk of chipping.
  • IGI certification: essential for validating both the lab origin and the actual gemological characteristics of the stone.

FAQs about Marquise Cut Lab Grown Diamonds

The bowtie effect is a dark, bow-tie-shaped shadow that appears in the center of some marquise diamonds (and also in oval and pear shapes). It occurs when the geometry of the cut prevents light from reflecting properly in that area. A faint bowtie is practically invisible, but a pronounced one detracts from the stone's brilliance. The IGI certificate helps identify if the cut minimizes this effect.

Yes. Both lab-grown and natural diamonds score 10 on the Mohs scale, the maximum hardness of any known natural material. The difference lies solely in their origin (lab vs. mine), not in their physical, optical, or chemical properties.

Yes. It is one of the most sought-after visual effects of this cut. The vertical orientation of the stone's major axis on the finger creates a continuous line that visually elongates the hand. It is especially flattering on hands with short or wide fingers.

The solitaire setting with six prongs (two at each end and two on the sides) is the most common. The prongs at the ends are essential to protect the most vulnerable areas of the cut. Halo settings also work well, surrounding the stone with small diamonds and emphasizing its elongated shape.

Yes. We have marquise diamonds in fancy colors such as yellow, pink, and blue, all with GIA certificates documenting the origin of the color (irradiation, color treatment, or controlled laboratory growth). Fancy colors in marquise diamonds are particularly striking due to the concentration of saturation at the ends of the stone.

In-stock lab diamonds are shipped within 24-48 business hours within Spain. For stones with very specific characteristics that require a factory order, the usual delivery time is less than 12 days. All shipments are insured and include a tracking number.