Marquise Diamond Buying Guide: Ratio, Points & Bow-Tie
The ratio most buyers prefer, why the pointed tips need a protective setting, and how to judge the bow-tie effect on a marquise.
Marquise is one of the most dramatically elongated diamond shapes available, with two sharp points that give it an unmistakable silhouette — and one genuine durability consideration that other elongated shapes don't share.
Length-to-width ratio
Most marquise buying guides put the classic, most widely liked window at roughly 1.85–2.10, with many buyers settling close to 2.00 — elongated enough to be unmistakably a marquise without reading as needle-thin. Below about 1.80 the stone starts to look plumper and less distinctly marquise; above roughly 2.20 it reads as slim and dramatic, a legitimate but more extreme look.
The points need a protective setting
A marquise's two sharp tips are its most vulnerable feature — genuinely more exposed to chipping than any point on an oval, emerald cut or elongated cushion. This is a setting decision, not a stone-quality one: a V-prong or shrouded claw specifically designed to shield each tip is standard practice for marquise, and once properly protected, a marquise wears as durably as any other shape. Slightly more rounded tips (rather than needle-sharp) also wear better long-term without meaningfully changing the elongated look — worth discussing with your jeweller when the setting is designed.
Bow-tie effect
Like other elongated shapes, marquise commonly shows a bow-tie — a soft, balanced shadow across the centre is normal and can add depth; an overly dark, heavy shadow usually points to a genuine cut-quality issue rather than being an inherent feature of the shape.
What to check before buying
- Ratio — decide deliberately within the roughly 1.85–2.20 range.
- Tip protection — this is a setting decision to make with your jeweller, not something the stone certificate will tell you.
- Symmetry — marquise shows asymmetry between its two halves more readily than most shapes; check the certificate and photos carefully.
- Certification — see our cert lab guide.
Related reading
- Oval diamond buying guide
- Ring settings guide: prong, bezel, halo & pavé
- Buying a loose diamond for a bespoke engagement ring
Sources: ratio and tip-protection guidance consolidated from current trade-jeweller buying guides (RockHer, Diamonds.pro, GOODSTONE).
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