Marquise diamonds are oval shaped diamonds with points on either end. These stones are a modified brilliant cut and share much of the fire of round and cushion stones. Marquise stones often appear larger than their actual carat weight as a result of their long, narrow appearance.
Symmetry is a key component to a beautiful marquise stone. Diamonds with end points that are even slightly misaligned can look twisted. HYSTR recommends that buyers purchase marquise stones with Very Good or better symmetry by GIA standards.
Some marquise stones can exhibit a 'bowtie effect', where a bowtie shaped darkness is visible in the middle of the stone. HYSTR's GIA Gemologists can examine stones to help a buyer choose a diamond with little to no bowtie effect.
The following tables provide additional guidance for understanding the cut, color, and clarity of marquise stones.
MARQUISE DIAMOND CUT GUIDE
| EXCELLENT | VERY GOOD | GOOD | FAIR / POOR | |
| Table % | 54 - 63 | 53.9 - 52 or 62.9 - 65 |
51.9 or 65.5 - 72 |
< 51 or > 68 |
| Depth % | 58 - 62 | 53 - 54.9 or 65.1 - 72 |
< 53 or > 72 |
|
| Length / Width Ratio | 1.82 - 2.00 | 1.75 - 1.819 or 2.009 - 2.17 |
1.63 - 1.749 or 2.171 - 2.32 |
< 1.63 or > 2.32 |
| Girdle | Very Thin - Slightly Thick | Very Thin to Thick | Very Thin to Very Thick or Ex. Thin to Ex. Thick | |
| Culet | None | Very Small | Small | > Medium |
OUR GIA GEMOLOGIST RECOMMENDS
The cut of a marquise diamond will impact the sparkle and size appearance of the stone.
Most diamond grading labs do not provide cut ratings, so use this table as a reference to determine how your stone will sparkle.
MARQUISE DIAMOND CLARITY GUIDE
| EXCELLENT | VERY GOOD | GOOD (Eye Clean) |
FAIR / POOR (Not Eye Clean) |
|
| < .50 Carats | FL - VS2 | VS2 - SI1 | SI2 | > I1 |
| .51 - 1.20 Carats | FL - VS1 | VS2 - SI1 | SI2 | > I1 |
| 1.21 - 2.00 Carats | FL - VS1 | VS2 - SI1 | SI2 | > I1 |
| > 2.00 Carats | FL - VVS2 | VS1 - VS2 | SI1 | > SI2 |
OUR GIA GEMOLOGIST RECOMMENDS
Marquise diamonds are somewhat forgiving of small clarity flaws. A diamond that is a lower clarity, but still 100% eye-clean, represents the best value.
Our gemologist recommends that clients purchase a stone with VS 2-SI 2 clarity. The inclusions in these stones will only be visible under magnification.
MARQUISE DIAMOND COLOR GUIDE
| EXCELLENT | VERY GOOD | GOOD (Looks White) |
FAIR / POOR (Color is Eye-Visible) |
|
| < .50 Carats | D - G | H - I | J | > J |
| .51 - 1.20 Carats | D - G | G - H | I | > I |
| 1.21 - 2.00 Carats | D - G | G | H | > H |
| > 2.00 Carats | D - F | G | H | > H |
| Fluorescence | None - Faint | Medium | Strong to Very Strong | |
OUR GIA GEMOLOGIST RECOMMENDS
Marquise diamonds show more visible color than many other shapes. A diamond that is a mid-range color, but still appears white, represents the best value.
Our gemologist recommends that clients purchase a stone with G - H color. The color in these stones will be difficult to detect with an untrained eye.
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