Loose Diamond
Octagon
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...
“The octagon diamond offers a distinctive visual identity while remaining accessible and wearable.”
Specialty cut, sourced to order
How it works
From your specification to your door
- 01 Choose Pick your shape, clarity and carat.
- 02 Curate We return three certified options.
- 03 Reserve A 50% deposit locks in your stone.
- 04 Settle Balance paid before dispatch.
4–6 weeks turnaround. Stones sourced from international laboratories.
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.
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.
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.
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
Loose Diamond
Carat range
1.0 — 5.0
Clarity
VS1 — FL
Origin
Lab-grown
Certification
IGI / GIA