Quick answer
What should I look for when buying a marquise diamond?
Judge a marquise by its actual outline, symmetry, bow-tie appearance, girdle, face-up dimensions and point protection—not by one supposedly ideal ratio. No general review can guarantee a bow-tie-free stone or certify the finished ring’s durability.
Key takeaways
- Inspect the two points, wings and overall outline for balance; personal preference still matters.
- Bow-tie appearance varies by stone and viewing conditions, so compare actual face-up imagery or video.
- Compare length-to-width ratios as descriptions of shape, not as universal pass/fail quality thresholds.
- Discuss point protection and setting construction for the specific stone without assuming one design guarantees safety.
- GIA does not assign an overall cut grade to marquise diamonds.
What defines a marquise
A marquise has an elongated outline with two pointed ends. Stones with the same shape label can differ in length, width, wing curvature, facet pattern and face-up appearance.
Review the outline and symmetry
Look at the two halves together: the points, shoulders and wings should be assessed on the actual stone. Symmetry is a report characteristic, but the grade alone does not replace reviewing the outline and appearance you prefer.
Look at the bow-tie in context
A bow-tie is a darker region that may appear across the center of an elongated brilliant diamond. Its visibility varies with the stone and viewing conditions. Review the stone face up, in motion and in more than one suitable lighting condition when available; do not rely on a promise that a marquise is bow-tie-free.
Compare proportions without a universal ideal
Length-to-width ratio can help describe whether a marquise looks broader or more elongated. It is not a universal quality score or a substitute for outline, symmetry and appearance. Compare stones with ratios as one piece of context, not as a pass/fail cutoff.
Discuss protection for the points
The pointed ends merit a conversation about the setting and how it covers or supports those areas. GIA describes protective setting approaches, but no setting name or remote image certifies security or durability for an individual ring.
When to get another review
If the shape, bow-tie or point protection remains unclear, ask for comparable media and construction details or request an independent review of the specific listing.
CaratSignal Research
Sources and methodology
- Guide to Diamond Engagement Ring ShapesGemological Institute of America · Researched September 28, 2026
- How to Protect Your Diamond Engagement RingGemological Institute of America · Researched September 28, 2026
- GIA Diamond Cut Grade: 6 Things You Need to KnowGemological Institute of America · Researched September 28, 2026
This guide follows the approved Wave 2 / Batch 11 editorial inventory. GIA is the primary gemological and educational source. Retailer product statements, where cited, are identified only as examples of specific construction choices—not as independent gemological authority or universal engineering standards. CaratSignal does not physically inspect or certify the security, durability, fit or value of a particular diamond or ring.
Read the research methodology- First published
- September 28, 2026
- Last researched
- September 28, 2026
- Last updated
- September 28, 2026
- Research status
- published