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Lab-grown octagon cut diamond

Loose Diamond

Lab-Grown Octagon Cut Diamond

Eight-Sided Distinction The octagon cut is an eight-sided diamond that bridges the gap between round and square shapes. Its symmetrical geometry and step-cu...

Sourced to your specification
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What carat weight?

We will source as close to your preference as quality allows.

Preferred clarity?

All stones meet a VS1 minimum. Higher grades involve longer sourcing windows.

Anything else we should know?

Setting preference, timing, budget guidance, certification requirements; anything that helps us source.

Where do we reach you?

One of our lapidaries will be in touch to begin sourcing your stone.

Pricing on request, every specialty cut is sourced to your specification

Cut
Octagon
Origin
Lab-grown
Certification
IGI / GIA
Lead time
4-6 weeks

How it works

From your specification to your door

  1. 01 Specify Tell us shape, carat and clarity.
    Step one, choose your diamond shape, carat and clarity
  2. 02 Curate We return three certified options.
    Step two, our lapidary curates a certified shortlist
  3. 03 Reserve A 50% deposit locks in your stone.
    Step three, reserve your chosen lab-grown diamond
  4. 04 Settle Balance paid before dispatch.
    Step four, settle the balance and receive insured delivery

4-6 weeks turnaround. Stones sourced from international laboratories.

The diamond

An overview

The octagon diamond is an eight-sided stone that occupies the geometric middle ground between a round and a square. Its equal-length sides and uniform internal angles create a shape of perfect symmetry, offering the softness of curved forms with the definition of angular ones. This balanced geometry makes the octagon a versatile choice that appeals to a wide range of aesthetic preferences.

Heritage

Origin & development

Octagonal diamond cutting draws on the long tradition of step-cut gemstone shapes, where geometric forms were chosen to maximise both beauty and material efficiency. The octagon has been a popular shape in coloured gemstone cutting for centuries - particularly for emeralds, which are commonly cut in octagonal step-cut form. Applied to diamonds, the octagon brings that same sense of classical proportion and geometric harmony, updated with modern cutting precision.

The cut

How it's shaped

The octagon features eight sides of equal or near-equal length, creating a regular polygon with uniform 135-degree internal angles. It can be faceted in either step-cut or brilliant style depending on the desired optical effect. Step-cut octagons emphasise clarity and geometric purity, while brilliant-cut versions deliver more traditional sparkle. The eight-sided perimeter provides natural seats for bezel settings and inspires creative halo designs that follow the stone's unique outline.

Why this cut

Highlights

The octagon diamond offers a distinctive visual identity while remaining accessible and wearable. Its eight-sided form is immediately recognisable yet not so unconventional as to limit setting options. The shape's inherent symmetry makes it satisfying to the eye from every angle, and its balanced proportions sit beautifully on the hand. For buyers drawn to geometric shapes who find hexagons too angular and rounds too conventional, the octagon is the ideal middle path.
Cut
Octagon
Carat range
1.0 to 5.0
Clarity
VS1 to FL
Origin
Lab-grown
Certification
IGI / GIA