TL;DR: half moon, lozenge and crescent diamonds are uncommon shapes that suit a bespoke design. Half moons are classic side stones, a lozenge gives a graphic art deco look, and a crescent adds a celestial note and is very rare. Availability varies, so we explain what is possible before you commit. Flat edges and points need protection, and a bezel or channel setting does that well. Pieces start from £600.
Half moon
A half circle with a flat edge. Pairs of half moons are classic side stones, set either side of a centre stone like a pair of wings. They add width and balance without competing with the centre.
Lozenge
A diamond or rhombus shape, with four equal sides set at an angle. It gives a graphic, art deco character and can look striking as a centre stone in a minimalist design.
Crescent
A curved shape like the moon. Crescents are very rare and are usually cut for a particular design. They suit people who love a celestial theme.
Using them in a ring
- Side stones: half moons beside a round or oval add width and balance.
- Centre stone: a lozenge can be striking in a minimalist setting.
- Accent stones: a crescent adds a celestial note, perhaps beside a round stone.
Pros and cons
- Pros: distinctive, flexible as side stones, and a talking point.
- Cons: flat edges and points need protection, and the shapes are uncommon, so choice is limited.
Design ideas
A pair of half moons either side of a round diamond gives a classic three stone look with a softer, winged outline. A lozenge set point to point on the finger can look like a modern jewel, particularly in a bezel. A small crescent tucked beside a round stone can suggest a moon and star without being obvious. For a wedding band, a row of tiny half moons set along the band makes a subtle pattern that catches the light.
Who these shapes suit
These shapes suit people who enjoy design and do not mind explaining their ring. They are a good fit for anyone drawn to art deco, to astronomy or to geometry, and they feel personal rather than expected. If you prefer a ring that blends in, a more familiar shape may be more comfortable, and we are happy to talk through both.
Settings
Bezels and channel settings protect the flat edges. Claws at the points guard the corners. A slim band keeps the focus on the shapes. Our guide to protecting the corners of step cut stones explains how to check a design for weak points.
Sourcing
These shapes are uncommon, so availability varies. We can discuss options, and we tell you in writing what is realistic before you commit. Browse the diamonds and lab grown colourless diamonds for a sense of what is available.
Working with us
We work by video consultation and message, send sketches and CAD renders, and make nothing until you approve the design in writing. Standard making time is 5 to 6 weeks, varying with your location and how busy we are, and a rare stone can take longer to find. Overseas, the customer pays import duty and tax, and delivery is insured and tracked with FedEx. For other unusual shapes, see unusual diamond shapes beyond oval and round.
Frequently asked questions
Are half moons durable?
The edges and points need protection, and a secure setting does this.
Can I mix these with other shapes?
Yes, they are often used with rounds and ovals.
Are they natural or lab grown?
Both can exist. We describe each stone clearly.
What does a ring cost?
Pieces start from £600.