Set a marquise on a finger and it draws a line where a round draws a dot. This 1.01 carat lab grown diamond runs 10.75 mm from point to point against 5.24 mm across the belly — a length-to-width ratio of 2.05:1, and the most elongating outline you can put into a setting. IGI report LG614397751 grades it D color and VS 1 clarity with excellent polish and excellent symmetry, and it is sold unset among our loose lab grown diamonds.
1.01 Carat
D Color
VS 1 Clarity
10.75 mm Long
IGI Certified
Excellent Polish & Symmetry
Why a marquise wears larger than its carat weight
Carat is a unit of weight, not a measure of size. Two stones can weigh the same and cover very different amounts of finger, and the marquise is the shape that pushes that gap furthest. A one carat round brilliant typically sits around 6.5 mm across. This marquise measures 10.75 mm end to end, roughly two thirds longer in its dominant direction, because the cutter spent the weight on length rather than depth.
That length does something specific on a hand. Worn north to south the points run with the finger and the eye follows them, which is why the shape has such a long reputation for making a hand look slender. Turned east to west it spans the finger instead, a look that has come back hard in modern design. Our guide to marquise engagement rings covers both orientations, and the finished pieces in the marquise engagement rings collection show how the outline behaves once it is set.
The faceting is marquise brilliant: the same brilliant-cut family as a round, bent into a boat-shaped outline with a point at each end. It returns light in broad flashes down the length of the stone rather than the even scatter of a round, and the two points are the part a setting has to look after.
Reading D color and VS 1 clarity on this report
D is the first letter on the diamond color scale and the top of it. Nothing is graded above it. The stone carries no body color, so against a white metal it stays bright instead of warming, and fluorescence is graded None, which means it looks the same under daylight, shop lighting and UV.
VS 1 stands for very slightly included. At that grade the inclusions are difficult for a trained grader to locate at 10x magnification, which in practice means nothing is visible to the unaided eye face-up. Clarity is worth having on a marquise, because the long open facets give the eye more room to travel than a busier shape does. The 4Cs guide sets out where each scale stops paying for itself.
Polish and symmetry are both graded Excellent, which describes the finish of the facet surfaces and how accurately they line up. The report states no overall cut grade, and that is normal for a fancy shape: overall cut grades are reserved for round brilliants, so polish, symmetry and the measurements are what a marquise report gives you instead. Our complete guide to lab grown diamonds walks through the rest of the certificate line by line.
What to build around it
A marquise carries a solitaire well because nothing else is competing with the outline. A four or six prong head with V-prongs at the two ends is the standard approach: the V tips wrap the points, which are the thinnest material on any pointed shape and the part most exposed to a knock.
It also anchors a three-stone ring cleanly, with tapered baguettes or smaller marquises following the same axis. A full halo works slightly against the elongation by widening the silhouette; a hidden halo lifts the stone without touching the outline at all. Browse solitaire settings and three-stone designs for the two most common directions, or read the breakdown of ring styles and setting types before you decide.
None of that is fixed yet, which is the argument for buying the stone loose. The diamond comes first and the ring is drawn around these exact dimensions.
How this diamond was grown
The IGI report records that the stone was created by Chemical Vapor Deposition. In CVD growth a thin diamond seed sits in a sealed chamber of carbon-rich gas, energy breaks the gas down, and carbon settles onto the seed atom by atom to build a single crystal over several weeks. The result is the same carbon lattice as any other diamond. Our explainer on how lab grown diamonds are made covers the equipment and the timeline.
The report classifies the stone as Type IIa, the purest diamond type, essentially free of nitrogen. It also carries one further note that we would rather state plainly than bury: the comments section says the diamond may include post-growth treatment. That is a routine and disclosed step in CVD production, heat and pressure applied after growth to bring a stone to its final color, and it is permanent. IGI graded this diamond D color and VS 1 in exactly the state you are buying it.
There is no mine behind a grown diamond, so the stone is conflict-free by origin with a production record rather than a supply chain to audit. If sourcing is the part of the decision that matters most to you, what makes jewelry ethical sets out how we think about it.
Every figure below is taken from IGI report LG614397751; the length-to-width ratio and the depth percentage are calculated from the measurements on that report. Diamond is also April’s birthstone, which makes a certified loose stone a considered commission for a birthday as well as a proposal — see April birthstone jewelry.
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Stone Laboratory grown diamond
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Shape and cut Marquise brilliant
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Carat weight 1.01 carat
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Measurements 10.75 x 5.24 x 3.14 mm
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Length to width 2.05:1 (calculated from the measurements)
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Depth 3.14 mm, about 60% of the 5.24 mm width
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Color grade D
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Clarity grade VS 1
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Cut grade Not stated on this report
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Polish Excellent
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Symmetry Excellent
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Fluorescence None
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Growth method Chemical Vapor Deposition (CVD); the report notes the stone may include post-growth treatment
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Diamond type Type IIa
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Inscription IGI LG614397751, laser-inscribed on the girdle
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Report IGI LG614397751, issued December 26, 2023
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Birthstone April
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Custom setting Available
Certification & care
The stone ships with IGI report LG614397751, issued December 26, 2023. Enter that number in IGI’s online report check and you will pull the same grading record quoted on this page — you do not have to take our word for a single figure. The number is also laser-inscribed on the girdle of the diamond, so the paperwork and the stone can always be matched to one another. If you are weighing one laboratory against another, IGI vs GIA certification explains what each report covers.
The measurements on the report, 10.75 x 5.24 x 3.14 mm, are the stone’s real dimensions and are worth handing to whoever makes the setting before any metal is cut. The 3.14 mm depth is about 60 percent of the 5.24 mm width.
Diamond is Mohs 10, the hardest material used in jewelry, so nothing in normal handling will scratch it. What dulls a loose stone is skin oil and dust settling on the pavilion, and that comes off in under a minute with warm water, a drop of dish soap and a soft brush. Dry it with a lint-free cloth and keep it in the box it arrives in rather than loose in a drawer, where it will scratch every softer stone it touches. Our notes on cleaning jewelry at home apply once it is set.
Marquise lab grown diamond questions
Is a lab grown diamond a real diamond?
Yes. This is a real diamond: the same carbon crystal structure, the same Mohs 10 hardness, the same optical behavior as a diamond taken out of the ground, and it is graded by IGI on exactly the same color and clarity scales. The only difference is where the crystal formed. Our article on whether lab grown diamonds are real diamonds goes through the science.
What does IGI report LG614397751 cover, and can I verify it myself?
It records the shape and cutting style, the measurements, carat weight, color grade, clarity grade, polish, symmetry, fluorescence, the growth method and the inscription. You can verify all of it independently by entering the report number on IGI’s own report-check page, which is the point of buying a certified stone rather than a described one.
The report mentions possible post-growth treatment. What does that mean?
It means IGI’s comments section states that the diamond was created by CVD growth and may include post-growth treatment. That is a normal, disclosed part of CVD production: heat and pressure applied after the crystal has been grown, which brings the stone to its final color. It is permanent, it does not affect hardness or durability, and the D color and VS 1 clarity on the report describe the diamond exactly as it is now. We would rather you read it here than find it on the certificate.
How white is D color, really?
D is the top grade on the scale and nothing sits above it. In practice that means no warmth at all, which matters most in white metals, where even a faint tint has nothing to hide behind. It is also worth knowing what you are paying for: G and H stones read as colorless to most people once they are in a finished ring, so D is a deliberate choice rather than a requirement.
Will I be able to see the VS 1 inclusions?
Not with your eyes. VS 1 means very slightly included, a grade at which the characteristics are difficult to locate even under 10x magnification, so the stone is eye-clean face-up. On a marquise that grade earns its keep, because the long open facets give an inclusion more room to show itself than a busier shape would.
Why is there no cut grade on the report?
Because overall cut grades are assigned to round brilliants. Fancy shapes such as the marquise are not graded that way, so the report states polish and symmetry instead — both Excellent here — and leaves the proportions to the measurements. Nothing is missing; it is simply how a fancy shape report is written, and we will not invent a grade IGI did not state.
How large will a 1.01 carat marquise look?
Larger than the weight suggests. The stone measures 10.75 x 5.24 mm, a long narrow footprint, while a one carat round brilliant is typically about 6.5 mm across. The weights are almost identical and the visual length is not close. Marquise is the shape that gives you the most spread per carat of any cutting style.
What is the difference between carat weight and millimeter size?
Carat is a unit of weight, one fifth of a gram. Millimeters describe the actual dimensions of the stone. Two diamonds of identical weight can look very different depending on how the cutter distributed that weight, deep and small or shallow and wide, which is why the measurements line on a report matters as much as the carat figure and why we quote both.
What is laser-inscribed on the diamond?
The girdle carries the inscription IGI LG614397751, matching the report number. It is microscopic and invisible without magnification, and it is what allows a jeweler to confirm that the stone in the setting is the stone on the certificate.
Can this stone be set into a ring, and who does that work?
Yes. Aquamarise builds custom rings around loose stones, so we can set this marquise into a design of your choosing and handle the final band sizing at the same time — setting and sizing are a jeweler’s job, done together, not something you arrange separately afterwards. Start at build your custom ring and quote the report number.
Which settings protect the points?
V-prongs. The two points of a marquise are the thinnest material on the stone, so a well-made marquise head wraps each tip in a V-shaped prong rather than a round claw. A bezel does the same job differently by enclosing the whole outline. Everything else — band width, metal, accent stones, orientation — is still open.
Will it pass a diamond tester?
Yes. Diamond testers read thermal conductivity, and a lab grown diamond conducts heat exactly as a mined one does, so it tests as diamond because it is diamond. Telling grown from mined requires specialist laboratory equipment, which is precisely why the stone is inscribed and certified.
How do I look after a loose diamond?
Keep it in its own box rather than loose with other jewelry, because at Mohs 10 it will scratch anything it touches. Clean it in warm water with mild dish soap and a soft brush, then dry it with a lint-free cloth. Skin oil on the pavilion is what makes a diamond look tired, and it lifts off in seconds.
How does a loose stone ship, and what if I change my mind?
Loose stones ship free within the USA, insured and tracked, with the IGI report in the parcel. The return terms that apply to a loose stone are set out on our returns and refunds page — read them before you order, particularly if you intend to have the diamond set.
Is a loose lab grown diamond a good investment?
Buy it because you want to wear it, not because you expect it to appreciate. Lab grown diamond prices have come down steadily as production has scaled, and resale on any diamond, grown or mined, sits well below retail. What certification does give you is a documented, verifiable stone that an appraiser can value on paper. Our piece on whether lab grown diamonds hold value is candid about it.
