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A Half Moon diamond is a crescent-shaped side stone — a semicircle with a flat straight edge and a curved outer edge — used in pairs to flank a center stone, most associated with Art Deco-era three-stone and cocktail rings. Guru Diam stocks 701+ Half Moon diamonds, calibrated and matched, IGI-gradable on request.
Why Half Moon side stones are hard to source well
The crescent outline makes matching harder than most side-stone shapes — two half moons need to mirror each other precisely (a true pair, not just two same-sized crescents) to sit symmetrically on either side of a center stone. That symmetry requirement is exactly why Half Moon has stayed a specialty item: most wholesalers carry a handful of loose pieces rather than genuine matched pairs cut for mirroring.
What Half Moon side stones are used for
Half Moons are almost always sold and set in pairs, flanking a round, oval, or cushion center stone. The style reads distinctly vintage — it’s a signature look in Art Deco and Retro-era three-stone rings — and remains popular for custom antique-style engagement rings and anniversary bands.
Sourcing a true matched pair
Guru Diam calibrates and mirrors Half Moon pairs in-house rather than pulling two similar loose stones, CVD lab-grown, IGI-gradable on request. Open a wholesale account for live pricing and to request a matched pair for a specific project.
FAQ
What is a Half Moon diamond used for? Half Moon diamonds are crescent-shaped side stones, almost always set in mirrored pairs flanking a center stone — most common in Art Deco-style and vintage-inspired three-stone rings.
Why is it hard to find a true matched pair of Half Moon diamonds? The two stones need to mirror each other precisely in curve and size to sit symmetrically, which is a harder matching problem than most side-stone shapes. Suppliers with deep in-house cutting can mirror pairs to spec; loose-stock dealers usually can’t.
Are Half Moon diamonds certified? They’re sold as calibrated matched-pair goods, IGI-gradable on request, following the same convention as other side-stone shapes.
