Engagement Rings ยท Side Stones
Half Moon Side Stones: The Curved Frame for a Centre Stone
Half moon side stones are shaped like a half circle, with the straight side facing the centre stone. Together they frame it like brackets โ elegant, balanced and a little vintage.
Written by the Mapple Gems workshop, Surat ยท Updated 30 September 2026
Short answer
Half moon side stones are D-shaped stones placed either side of a centre stone, with their flat edges facing inward and their curves facing out. They create a rounded, balanced three-stone look that suits cushion, oval, pear and round centres. Check that the flat edges line up closely with the centre stone and that both side stones are a true mirror pair.
Side stones change a ring's whole outline. Where tapered baguettes point toward the centre and trapezoids widen it, half moons soften it, giving a gentle rounded silhouette.
Side stone shapes compared
| Side stone | Effect | Suits |
|---|---|---|
| Half moon | Soft, rounded frame | Cushion, oval, pear, round |
| Trapezoid | Widens, architectural | Emerald, radiant, Asscher |
| Tapered baguette | Points inward | Most shapes |
| Pear | Romantic, flowing | Oval, round |
From the bench in Surat
Half moons look simplest and are among the hardest side stones to get right. The flat edge has to be almost exactly as long as the centre stone is wide at that point, or the frame looks mismatched โ too short and the centre stone overhangs; too long and the side stones stick out past it. The two stones must also be a true mirror pair. We cut and match half moons to the specific centre stone rather than picking them from stock, and we'd suggest checking the side view too: the tops of all three stones should sit at a harmonious height.
Who suits half moon side stones
Anyone who wants a three-stone ring with a softer, more classic outline. For comparison, see trapezoid side stones and side stone rings explained.
Checklist
- Check the flat edges line up with the centre stone.
- Check the two side stones are a mirror pair.
- Look at the side view for balanced heights.
- Choose half moons for a soft, rounded frame.
- Match side stone colour to the centre.
- Check the corners are protected.
- Plan a wedding band that sits beside all three.
- Choose solid gold or 925 silver.
Half moon FAQs
What are half moon side stones?
D-shaped stones set either side of a centre stone, flat edges facing in and curved edges facing out.
Which centre stones suit half moons?
Cushion, oval, pear and round centres, where the rounded outline complements the shape.
Half moon or trapezoid side stones?
Half moons give a soft, rounded look; trapezoids give a straighter, architectural one.
Why must half moons be matched?
Their flat edges must match the centre stone's width, and the two must mirror each other, or the frame looks uneven.
A softer three-stone
Half moon three-stone moissanite rings, made to order in Surat.
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