Marquise-Cut Diamonds: A Complete Guide
Marquise Diamond Overview
Marquise diamonds, inspired by the Marquise of Pompadour, feature a unique, elongated shape that maximizes visual size. Their large crown surface area per carat creates the impression of a larger diamond, and their slender profile elongates and slims the finger. This modified brilliant cut is a great choice for maximizing visual size and elegance.
Bow-Tie Effect
Like oval diamonds, marquise cuts may exhibit a bow-tie effect—shadows across the center varying from minimal to pronounced. This effect is best assessed through visual inspection. For personal assistance or to have a diamond inspected before purchase, reach out to Valentino Nicosia at vn@lvndiamonds.be.
Marquise Diamond Length-to-Width (LW) Ratios
While personal preference influences how narrow or broad a marquise diamond appears, a classic length-to-width ratio ranges between 1.75 and 2.15. LVN Diamonds provides accurate measurements, including the ratio, so you’ll know the exact shape of the diamond.
Importance of Symmetry
Symmetry in marquise diamonds is critical. The pointed ends should align perfectly, with both sides forming near mirror images. Misaligned points can create an uneven appearance once set, so opt for diamonds with excellent or very good symmetry.
Setting Recommendations
Marquise diamonds should be secured with prongs at both ends to prevent chipping. These tips were closest to the rough stone’s outer edge, where inclusions may be present. However, once set, prongs cover these minor flaws unless they compromise the diamond’s stability—rare but possible.
Cut Evaluation Guide
Here’s a general guide to evaluate the cut quality of marquise diamonds:
| Cut Quality | Table % | Depth % | Girdle | Culet | LW Ratio |
|---|---|---|---|---|---|
| Excellent | 53-63 | 58-62 | Very Thin - Slightly Thick | None | 1.85-2.00 |
| Very Good | 52 or 64-65 | 56-57.9 or 62.1-66 | Very Thin to Thick | Very Small | 1.75-1.84 or 2.01-2.15 |
| Good | 51 or 66-68 | 53-55.9 or 66.1-71 | Very Thin to Very Thick | Small | 1.65-1.74 or 2.16-2.30 |
| Fair | 50 or 69-70 | 50-52.9 or 71.1-74 | Extremely Thin to Extremely Thick | Medium | 1.55-1.64 or 2.31-2.45 |
| Poor | <50 or >70 | <50 or >74 | >Medium | <1.55 or >2.45 |
Evaluating Color
Color assessment is subjective. Some prefer warmer G-H grades over the cooler D-F grades, even though higher grades command a premium due to demand. For larger marquise diamonds (over 1 carat), consider moving up a color grade as the points may appear darker. Here’s a color guide:
| Carat Weight | Excellent (D-G) | Very Good (H-I) | Good (J-K) | Fair (L-M) | Poor (> M) |
|---|---|---|---|---|---|
| < .50 ct. | D-G | H-I | J-K | L-M | > M |
| .51-1.0 ct. | D-F | G | H-I | J-K | > K |
| 1.0-2.0 ct. | D-F | G-H | I-J | > J | |
| > 2.0 ct. | D-F | G | H-I | > I |
Fluorescence
Diamond fluorescence can range from none to very strong. Faint to medium fluorescence can be acceptable, while strong or very strong may affect appearance.
Clarity Considerations
Clarity evaluation varies by customer preference. Some may tolerate minor inclusions if they’re invisible, while others seek higher clarity. The GIA provides clarity grading, but personal standards differ. Here’s a guide:
| Carat Weight | Excellent (FL-VS2) | Very Good (SI1-SI2) | Good (I1) | Fair (I2) | Poor (> I2) |
|---|---|---|---|---|---|
| < .50 ct. | FL-VS2 | SI1-SI2 | I1 | I2 | > I2 |
| .51-1.0 ct. | FL-VS1 | VS2-SI1 | SI2 | I1-I2 | > I2 |
| 1.0-2.0 ct. | FL-VVS2 | VS1-VS2 | SI1-SI2 | I1 | > I1 |
| > 2.0 ct. | FL-VVS2 | VS1-VS2 | SI1 | SI2 | > SI2 |
If you have additional questions about marquise diamonds or need assistance finding the perfect stone, contact Valentino Nicosia at vn@lvndiamonds.be or visit lvndiamonds.be/diamonds.