Melbourne client care · Made in Surat
The length-to-width ratio of a diamond determines how elongated or compact it appears. For fancy shapes — oval, pear, cushion, emerald, radiant, marquise — this ratio is the single most important proportion decision after cut quality. This guide explains every ratio and what it means in practice.
The length-to-width ratio (L:W ratio) is the relationship between the longer and shorter dimensions of a diamond — the length divided by the width. For a round diamond, this is always 1.00. For fancy shapes, it determines how elongated the stone appears.
A ratio of 1.00 is perfectly square or circular. A ratio of 1.50 means the stone is 50% longer than it is wide. A ratio of 2.00 means the stone is twice as long as it is wide — very elongated.
The ratio matters enormously because it determines how the stone appears on the hand, how much it elongates the finger and what the visual character of the shape is. Two oval diamonds of the same carat weight can look completely different if one has a 1.35 ratio and the other has a 1.55 ratio.
| Shape | Compact Range | Classic / Most Popular Range | Elongated Range | Very Elongated |
|---|---|---|---|---|
| Oval | 1.25–1.35 | 1.35–1.50 | 1.50–1.65 | 1.65+ |
| Pear | 1.40–1.55 | 1.55–1.75 | 1.75–1.90 | 1.90+ |
| Cushion (standard) | 1.00–1.05 | 1.05–1.15 | 1.15–1.25 | 1.25+ |
| Elongated Cushion | 1.20–1.25 | 1.25–1.35 | 1.35–1.45 | 1.45+ |
| Marquise | 1.70–1.85 | 1.85–2.10 | 2.10–2.30 | 2.30+ |
| Emerald Cut | 1.25–1.35 | 1.35–1.50 | 1.50–1.65 | 1.65+ |
| Radiant | 1.00–1.05 | 1.10–1.25 | 1.25–1.35 | 1.35+ |
| Princess | 1.00–1.03 | 1.00–1.05 | 1.05+ | Not typically used |
| Asscher | 1.00–1.03 | 1.00–1.05 | N/A | N/A |
The ratio determines how much of the finger the stone covers along its length. A higher ratio creates more elongation; a lower ratio creates a more compact appearance.
For oval and pear cuts, the length-to-width ratio affects the bow tie. Generally, stones at either extreme of the ratio range — very compact or very elongated — tend to have more pronounced bow tie effects.
Book a free online consultation. Yash Chandpara shows stones at different ratios for the same shape on screen — the difference in appearance is immediately clear.
