If you’re deciding between moissanite and diamond for a piece of fine jewelry—especially for an engagement ring—carat weight and visual size are two of the most important factors to understand. These two stones may look similar at a glance, but their differences can impact both design and budget.
Here’s a straightforward breakdown of how moissanite and diamonds compare, starting with the key detail: carat weight vs. visual size.
Moissanite vs. Diamond: Carat Weight Is Not Size
Carat weight measures how much a gemstone weighs, not how large it appears. Because moissanite is less dense than diamond, a moissanite stone will always appear larger than a diamond of the same carat weight.
What that means in practice:
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A 1-carat diamond typically measures around 6.5mm in diameter.
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A 1-carat moissanite measures closer to 6.8mm—about the size of a 1.1 to 1.2-carat diamond.
The result: Moissanite gives you a larger look for the same carat weight. This makes it a practical choice if size is your priority, especially in designs like halo settings, three-stone rings, or statement pendants.
Brilliance: How They Sparkle
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Diamonds offer a clean, white sparkle—classic and elegant.
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Moissanite reflects more colored light, creating intense fire and brilliance.
If you love bold sparkle, moissanite shines brighter. If you prefer a more subtle glow, diamond is your match.
Durability for Everyday Wear
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Diamond: Mohs hardness of 10 (hardest gemstone)
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Moissanite: Mohs hardness of 9.25–9.5 (very durable)
Both are excellent choices for daily wear in engagement rings, wedding bands, or heirloom redesigns.
Color and Clarity
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Diamonds: Graded on a D–Z scale. D–F diamonds are colorless and prized for their brilliance.
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Moissanite: Sold as near-colorless or colorless, but may show warmth in larger sizes or cool-tone metals.
Clarity: Moissanite typically has fewer inclusions. We hand-select all diamonds for clarity and performance.
Cost and Value
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Moissanite: Lower cost, larger visual size, excellent for those who want to maximize design options.
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Diamonds: Higher initial investment, greater long-term value, ideal for traditional or legacy pieces.
If you want more sparkle for your budget or are designing a larger, bolder piece—moissanite delivers. If you’re creating a timeless heirloom or prioritizing resale value—diamond is the right choice.
Which Is Right for You?
Choose moissanite if:
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You want a bigger look for less
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You love extra sparkle
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You’re customizing a bold or fashion-forward design
Choose diamond if:
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You value tradition and investment
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You want a classic look
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You’re designing a legacy piece
Our Advice at Martin Busch Jewelers
We help clients find the right stone for their style, budget, and vision every day. Whether you’re starting from scratch or reimagining something old, our team will guide you through your options—with side-by-side comparisons, custom design mockups, and expert advice.
Visit Us in New York’s Financial District
Martin Busch Jewelers
85 John Street, New York, NY 10038
(212) 349-2230
Final Word: Carat Weight Is Just the Start
Carat weight doesn’t tell the full story. Visual size, brilliance, and budget all matter when choosing between moissanite and diamond. At Martin Busch Jewelers, we’re here to help you understand the difference—and create something extraordinary, no matter which stone you choose.
Ready to compare in person? Let’s talk.