Moissanite Size Chart: Millimeter to Carat Conversion Guide
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Moissanite is sold by millimeter size, not carat weight. This catches many shoppers off guard.
A 6.5mm round moissanite looks identical to a 1-carat diamond on your finger. It just weighs less; around 0.88 carats. Because moissanite is about 10% lighter than diamond at the same physical size, the industry uses millimeters and Diamond Equivalent Weight (DEW) or Carat Equivalent (CTE) instead.
This moissanite size chart breaks down the mm to carat conversion for every shape Zen Moissanite carries. Find the exact stone size you want, no guesswork.
A 6.5mm round moissanite looks identical to a 1-carat diamond on your finger. It just weighs less; around 0.88 carats. Because moissanite is about 10% lighter than diamond at the same physical size, the industry uses millimeters and Diamond Equivalent Weight (DEW) or Carat Equivalent (CTE) instead.
This moissanite size chart breaks down the mm to carat conversion for every shape Zen Moissanite carries. Find the exact stone size you want, no guesswork.
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Why Moissanite Uses Millimeters Instead of Carats
Carat weight alone does not tell you how big a moissanite will look on your hand. Moissanite has a density of 3.22 g/cm³ compared to diamond at 3.52 g/cm³. That gap means moissanite is always lighter than a diamond of the same dimensions.
Diamond Equivalent Weight solves this. DEW tells you the carat weight a diamond would be at the same mm size. When Zen Moissanite lists a stone as "1ct DEW," it means the stone measures 6.5mm and looks like a 1-carat diamond.
-mm measures the face-up size you actually see
-Carat measures actual weight on a scale
-DEW tells you the diamond size it matches visually
-Moissanite weighs roughly 10% less than diamond at the same mm Always reference mm when ordering moissanite
Every chart in this guide uses DEW so you can compare directly to diamond carat sizes.
Diamond Equivalent Weight solves this. DEW tells you the carat weight a diamond would be at the same mm size. When Zen Moissanite lists a stone as "1ct DEW," it means the stone measures 6.5mm and looks like a 1-carat diamond.
-mm measures the face-up size you actually see
-Carat measures actual weight on a scale
-DEW tells you the diamond size it matches visually
-Moissanite weighs roughly 10% less than diamond at the same mm Always reference mm when ordering moissanite
Every chart in this guide uses DEW so you can compare directly to diamond carat sizes.
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Round Moissanite Size Chart: mm to Carat
Round brilliant is the most popular moissanite shape and the simplest to convert - you only need the diameter. It maximizes sparkle and serves as the baseline every other shape is compared against.
The 6.5mm is the most requested size for round moissanite engagement rings. Going up just half a millimeter to 7.0mm adds about 0.25ct of visual presence.
| mm Diameter | DEW (Carat Equivalent) |
|---|---|
| 4.0mm | 0.25ct |
| 5.0mm | 0.50ct |
| 6.0mm | 0.75ct |
| 6.5mm | 1.00ct |
| 7.0mm | 1.25ct |
| 7.5mm | 1.50ct |
| 8.0mm | 2.00ct |
| 9.0mm | 3.00ct |
The 6.5mm is the most requested size for round moissanite engagement rings. Going up just half a millimeter to 7.0mm adds about 0.25ct of visual presence.
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Oval Moissanite Size Chart: mm to Carat
Oval moissanite rings looks larger than a round stone of the same carat weight. The elongated shape spreads surface area across more finger space, making it one of the best choices for maximum visual impact.
Ovals appear 10–15% larger face-up compared to rounds at the same DEW. Keep the length-to-width ratio around 1.4:1 to 1.5:1 to avoid the "bowtie" shadow that appears in ovals cut too long.
| mm (L x W) | DEW (Carat Equivalent) |
|---|---|
| 5x3mm | 0.25ct |
| 6x4mm | 0.50ct |
| 7x5mm | 1.00ct |
| 8x6mm | 1.50ct |
| 9x7mm | 2.00ct |
| 10x8mm | 3.00ct |
Ovals appear 10–15% larger face-up compared to rounds at the same DEW. Keep the length-to-width ratio around 1.4:1 to 1.5:1 to avoid the "bowtie" shadow that appears in ovals cut too long.
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$1,800.00
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$2,150.00
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$2,450.00
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Cushion Moissanite Size Chart: mm to Carat
Cushion moissanite has rounded corners and larger facets that produce a soft, warm sparkle. It comes in standard square and elongated styles.
Elongated cushion looks bigger on the finger than square cushion at the same carat weight. It gives that stretched, flattering look without going up in carats.
| Standard Cushion | |
|---|---|
| mm (L x W) | DEW (Carat Equivalent) |
| 5x5mm | 0.60ct |
| 6x6mm | 1.00ct |
| 6.5x6.5mm | 1.30ct |
| 7x7mm | 1.60ct |
| 7.5x7.5mm | 2.00ct |
| 8x8mm | 2.40ct |
| Elongated Cushion | |
|---|---|
| mm (L x W) | DEW (Carat Equivalent) |
| 7x5mm | 0.75ct |
| 8x6mm | 1.25ct |
| 9x7mm | 2.00ct |
| 10x8mm | 3.00ct |
Elongated cushion looks bigger on the finger than square cushion at the same carat weight. It gives that stretched, flattering look without going up in carats.
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$2,400.00
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$2,150.00
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$1,800.00
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$2,450.00
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Emerald Moissanite Size Chart: mm to Carat
Emerald moissanite uses step-cut faceting that creates a hall-of-mirrors effect. Instead of intense sparkle, you get clean lines and flashes of light that highlight the stone's clarity
A 7x5mm emerald gives you the 1-carat look. For a bolder statement, 9x7mm hits the 2.5ct sweet spot that stands out without feeling oversized.
| mm (L x W) | DEW (Carat Equivalent) |
|---|---|
| 6x4mm | 0.50ct |
| 7x5mm | 1.00ct |
| 8x6mm | 1.50ct |
| 9x7mm | 2.50ct |
| 10x8mm | 3.50ct |
A 7x5mm emerald gives you the 1-carat look. For a bolder statement, 9x7mm hits the 2.5ct sweet spot that stands out without feeling oversized.
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$2,100.00
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$2,100.00
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$2,700.00
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$2,450.00
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Pear Moissanite Size Chart: mm to Carat
Pear moissanite tapers to a point at one end and rounds at the other. This teardrop shape elongates the finger and appears larger per carat than most cuts.
The best aspect ratio for a pear is between 1.5:1 and 1.75:1 to keep the shape balanced.
| mm (L x W) | DEW (Carat Equivalent) |
|---|---|
| 6x4mm | 0.33ct |
| 8x5mm | 1.00ct |
| 9x6mm | 1.50ct |
| 10x7mm | 2.00ct |
| 12x8mm | 3.50ct |
The best aspect ratio for a pear is between 1.5:1 and 1.75:1 to keep the shape balanced.
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$3,300.00
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$2,400.00
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$3,150.00
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Marquise Moissanite Size Chart: mm to Carat
Marquise moissanite has two pointed ends and a wide center. It looks significantly larger face-up than other shapes at the same carat weight.
A 10x5mm marquise covers more finger than a round of the same weight. The ideal ratio is 2:1.
| mm (L x W) | DEW (Carat Equivalent) |
|---|---|
| 8x4mm | 0.50ct |
| 10x5mm | 1.00ct |
| 12x6mm | 2.00ct |
| 14x7mm | 3.00ct |
A 10x5mm marquise covers more finger than a round of the same weight. The ideal ratio is 2:1.
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$2,400.00
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$2,400.00
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$1,800.00
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Radiant Moissanite Size Chart: mm to Carat
Radiant moissanite cut combines the shape of an emerald with the fire of a round brilliant. Trimmed corners and 70 facets create intense sparkle in a rectangular silhouette.
| mm (L x W) | DEW (Carat Equivalent) |
|---|---|
| 6x4mm | 0.50ct |
| 7x5mm | 1.00ct |
| 8x6mm | 1.80ct |
| 9x7mm | 3.00ct |
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Princess Moissanite Size Chart: mm to Carat
Princess moissanite cut is a square shape with sharp corners and brilliant faceting. Like rounds, it is measured by a single width dimension.
Princess cuts carry more weight in depth, so they can look slightly smaller face-up than a round of the same DEW. Consider going up 0.25ct to match the visual presence you want.
| mm Width | DEW (Carat Equivalent) |
|---|---|
| 4.5mm | 0.50ct |
| 5.5mm | 1.00ct |
| 6.0mm | 1.25ct |
| 6.5mm | 1.50ct |
| 7.0mm | 2.00ct |
Princess cuts carry more weight in depth, so they can look slightly smaller face-up than a round of the same DEW. Consider going up 0.25ct to match the visual presence you want.
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$2,400.00
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$2,400.00
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$4,200.00
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How Zen Moissanite Helps You Find the Right Stone Size
At Zen Moissanite, we list every loose stone and engagement ring with clear mm dimensions and DEW so there is no confusion between what you order and what arrives on your finger.
Our team offers virtual, phone, and in-person consultations where we walk you through sizing, shape comparisons, and how each millimeter translates to real finger presence.
Whether you are browsing our in-stock collection or designing a custom ring, our moissanite size chart and expert guidance take the guesswork out. Book a consultation or explore our loose stones to get started.
Diamond Equivalent Weight solves this. DEW tells you the carat weight a diamond would be at the same mm size. When Zen Moissanite lists a stone as "1ct DEW," it means the stone measures 6.5mm and looks like a 1-carat diamond.
-mm measures the face-up size you actually see
-Carat measures actual weight on a scale
-DEW tells you the diamond size it matches visually
-Moissanite weighs roughly 10% less than diamond at the same mm Always reference mm when ordering moissanite
Every chart in this guide uses DEW so you can compare directly to diamond carat sizes.
-mm measures the face-up size you actually see
-Carat measures actual weight on a scale
-DEW tells you the diamond size it matches visually
-Moissanite weighs roughly 10% less than diamond at the same mm Always reference mm when ordering moissanite
Every chart in this guide uses DEW so you can compare directly to diamond carat sizes.
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