How to Choose a Moissanite Length-to-Width Ratio
Length-to-width ratio describes the outline of a stone and has a strong effect on whether it appears compact, balanced, or distinctly elongated. There is no single ideal ratio for every buyer. The right choice depends on shape, finger coverage, setting style, and personal preference.
How the ratio is calculated
Divide the stone's length by its width. A 10 x 7 mm stone has a ratio of approximately 1.43.
What lower and higher ratios look like
Lower ratios create a fuller, broader outline. Higher ratios create a slimmer and more elongated appearance. Extremely high ratios may look narrow or require additional attention to setting security.
Common visual ranges
| Shape | Broader look | Balanced elongated look | More slender look |
|---|---|---|---|
| Oval | About 1.30-1.35 | About 1.36-1.45 | About 1.46 and above |
| Radiant | About 1.20-1.30 | About 1.31-1.45 | About 1.46 and above |
| Emerald | About 1.30-1.40 | About 1.41-1.50 | About 1.51 and above |
| Cushion | About 1.00-1.15 | About 1.16-1.30 | About 1.31 and above |
These are visual guidelines rather than quality grades.
What else to consider
- Finger length and width
- North-south or east-west orientation
- Band width
- Prong or bezel coverage
- Stone symmetry
- Wedding-band pairing
Frequently asked questions
Does a higher ratio make a stone look larger?
It can create more lengthwise coverage, but visible size also depends on width, depth, and setting design.
Is there a best ratio for every shape?
No. Ratio is primarily an aesthetic choice as long as the stone remains symmetrical and suitable for a secure setting.
Can a custom setting accommodate any ratio?
Many ratios can be accommodated, but very broad or very slender stones may require a setting designed specifically for their dimensions.