Lab-grown oval diamond

The oval lab-grown diamond is one of the most sought-after cuts on the market today. Its elongated and rounded silhouette combines the brilliance of the round brilliant cut with a shape that visually slims the finger. It is a diamond created in a laboratory, with the same chemical composition, crystalline structure, and optical properties as an earth-mined diamond. The difference lies in its origin: instead of forming over millions of years under extreme pressure, it grows in weeks through controlled CVD or HPHT processes.

The result is a stone indistinguishable from a natural diamond, with a significantly lower environmental impact and a more accessible price for the same quality.

Why choose an oval lab-grown diamond

The oval lab-grown diamond has several specific advantages over its natural counterpart:

Up to more than 80% lower price

For the same budget, you can access a much larger size and higher clarity in a lab-grown diamond. This is an objective advantage that more and more buyers value before making a decision.

Guaranteed IGI Certification

All our oval diamonds are certified by the IGI (International Gemological Institute), the world's leading laboratory for lab-grown diamonds. The certificate includes the four fundamental characteristics of the stone: cut, color, clarity, and carat weight.

Traceable and ethical origin

Unlike many natural diamonds, lab-grown diamonds have a completely traceable origin. They do not come from conflict zones, do not involve invasive extraction, and have a significantly lower carbon footprint.

Same physical and optical properties

An oval lab-grown diamond has the same hardness (10 on the Mohs scale), the same refractive index, and the same light dispersion as a natural one. Only a gemologist with specialized equipment can distinguish them.

How the oval cut is created in a lab-grown diamond

The oval cut starts from a rough diamond and is worked to achieve a length-to-width ratio that generally ranges between 1.30 and 1.50. This ratio determines whether the oval appears more round or more elongated, and has a direct impact on how the size of the stone is perceived.

The cutting process is identical to that of a natural diamond: specialized artisans work the stone with precision tools to maximize brilliance and minimize material loss. The final result depends on both the quality of the rough stone and the skill of the cutter.

The 4Cs of the oval diamond

Cut

The oval cut does not have an official cut standard like the round brilliant, so IGI certificates do not assign a direct cut grade. What is evaluated is symmetry, polish, and overall proportions. A good oval exhibits a minimal bow-tie pattern (the dark, butterfly-shaped shadow that appears in the center) and uniform light distribution.

Color

The color scale ranges from D (colorless) to Z (visible yellow). For an oval diamond, it is recommended to start from F to D.

Clarity

The most common inclusions in oval lab-grown diamonds are the marks inherent to the growth process. For this cut, a clarity of VVS1 or VVS2 is sufficient: the inclusions are not visible to the naked eye.

Carat Weight

The oval shape has an objective visual advantage: it appears larger than its carat weight indicates. A 1 ct oval can look as large or even larger than a 1.10 ct round, depending on its proportions. This is an important factor to consider when comparing options.

IGI certification for oval lab-grown diamonds

The IGI certificate for an oval lab-grown diamond includes a complete description of the stone: measurements in millimeters, length-to-width ratio, table and depth percentage, symmetry grade, polish, and, if relevant, the growth type (CVD or HPHT). This document is the formal guarantee of what you are buying.

At Diamante de Laboratorio, we work exclusively with certified stones.

How to choose your oval diamond

Before deciding on an oval lab-grown diamond, there are three key aspects worth reviewing:

The length-to-width ratio defines the character of the stone. A ratio of 1.35 is the most balanced and most in-demand. Above 1.50, the oval becomes more elongated and slender; below 1.30, it approaches a round shape.

The bow-tie is inevitable in ovals, but its intensity varies. A very pronounced shadow reduces the brilliance and visibility of the stone. IGI certificates do not grade it directly, but the videos of each stone allow for evaluation.

The setting influences the cut. Ovals look especially good in solitaire, side pave, or halo settings, where the elongated shape takes center stage.