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Lab-grown half-moon cut diamond

Loose Diamond

Lab-Grown Half-Moon Cut Diamond

Crescent Elegance The half-moon cut is a semi-circular diamond with one straight edge and one curved edge. Its unique crescent profile makes it the ideal co...

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
Half-Moon
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 half-moon diamond is a semi-circular stone with one straight edge and one curved edge, forming a crescent or D-shaped profile. This distinctive geometry makes it the ideal companion for round and oval centre stones, as the curved edge nestles against the centre diamond while the straight edge aligns with the band. The result is a seamless, flowing composition that feels organic and intentional.

Heritage

Origin & development

The half-moon cut was developed as a solution to a specific design challenge: how to create accent stones that follow the contour of curved centre diamonds. Standard baguettes and trapezoids leave visible gaps when placed alongside round or oval centres, breaking the visual flow. By cutting a stone with one curved and one straight edge, jewellers created a shape that conforms perfectly to curved outlines, establishing the half-moon as an essential accent shape for contemporary ring design.

The cut

How it's shaped

The half-moon features a semi-circular outline created by one curved edge (matching the curve of the intended centre stone) and one straight edge. Modified brilliant faceting is typically used to maximise light return within the semi-circular form. The curvature of the rounded edge is carefully calibrated to match specific centre stone sizes, ensuring a flush fit with minimal gap. This precision cutting makes each half-moon a bespoke element designed for its specific position in the ring.

Why this cut

Highlights

Half-moon diamonds solve the design problem that no other accent shape can - creating a seamless visual curve alongside round and oval centre stones. Their crescent profile hugs the centre diamond, producing a unified composition that feels like a single flowing form rather than separate stones side by side. The brilliant faceting ensures the half-moons sparkle in harmony with the centre, adding light and presence without disrupting the design's rhythm. For engagement rings featuring round or oval centres, half-moons are the definitive accent choice.
Cut
Half-Moon
Carat range
1.0 to 5.0
Clarity
VS1 to FL
Origin
Lab-grown
Certification
IGI / GIA