Moissanite Shapes and Sizes: The Complete Buying Guide (2026)

Choosing the right moissanite shape and size is one of the most important decisions you will make when buying an engagement ring — yet most buyers have no idea where to start.

With 9 different shapes available and sizes ranging from 2mm to 15mm, the options can feel overwhelming. In this complete guide we break down every moissanite shape available, what each one looks like on the finger, which sizes are most popular, and how moissanite carat weight compares to diamond equivalent weight — so you can buy with complete confidence.

Whether you are considering a classic round brilliant, an elegant oval, or a bold cushion cut — this guide covers everything you need to know about moissanite shapes and sizes before you buy.

Ready to browse? Shop our full moissanite collection → Here

What is Moissanite? A Quick Overview

Moissanite is a gemstone made from silicon carbide, originally discovered in a meteorite crater in 1893 by Nobel Prize-winning scientist Henri Moissan. Today, moissanite is created in controlled laboratory environments, producing stones that are chemically and optically unique from diamonds but visually almost identical.

Moissanite scores 9.25 on the Mohs hardness scale — second only to diamond at 10 — making it one of the most durable gemstones available for everyday wear. It also produces more fire and brilliance than a natural diamond of the same size, meaning it catches light more dramatically.

At Forever For Love we carry both premium moissanite and IGI certified lab diamonds, giving you the widest possible choice for your engagement ring or fine jewelry purchase.

 

Moissanite Sizes Explained: MM to Carat Size Chart

When shopping for moissanite, you will see two measurements used: the physical size in millimetres (mm) and the carat weight. Unlike diamonds, moissanite has its own carat weight (MOI) which differs from its Diamond Equivalent Weight (DEW) because moissanite is less dense than diamond.

Always shop by DEW (Diamond Equivalent Weight) when comparing moissanite to diamond sizes — this tells you what carat diamond your moissanite looks equivalent to on the finger.

Round Brilliant Moissanite — Popular Sizes Quick Reference:

MM SIZE	MOI CARAT	DEW CARAT	POPULAR FOR
5.5mm	0.68	0.80	Delicate rings
6mm	0.80	1.00	Most popular
6.5mm	1.10	1.20	Classic 1ct look
7mm	1.35	1.50	Statement rings

7.5mm	1.60	1.90	Bold choice
8mm	1.90	2.20	Show-stopping
8.5mm	2.26	2.70	Luxury look
9mm	2.75	3.10	Halo settings

 

Which Moissanite Shape is Right for You?

BY FINGER TYPE:

Short or wide fingers: Choose oval, pear, or marquise — their elongated shape creates the illusion of a longer, slimmer finger.

Long or slim fingers: Any shape works beautifully. Round, cushion, and emerald cuts look particularly striking on longer fingers.

BY PERSONALITY:

Classic and timeless: Round brilliant — the most popular engagement ring shape in the world for good reason.

Romantic and feminine: Oval, pear, or heart — soft curves with exceptional brilliance.

Modern and bold: Emerald, radiant, or square brilliant — clean architectural lines.

Truly one of a kind: Marquise, trillion, or triangle — shapes that turn heads and start conversations.

BY BUDGET (most visual size per dollar):

Looks largest for size: Oval and marquise — their elongated shape makes them appear larger than a round of the same carat weight.

Best brilliance per dollar: Round brilliant — engineered specifically for maximum light return.

 

Moissanite vs Lab Diamond: Which Should You Choose?

FEATURE	MOISSANITE	LAB DIAMOND
Price	60–80% less than natural diamond	40–60% less than natural diamond
Hardness	9.25 on Mohs scale	10 on Mohs scale (hardest)
Brilliance	More fire and colour flash	White light brilliance
Certification	Charles & Colvard cert	IGI or GIA certified
Resale Value	Lower resale value	Moderate resale value
Best For	Maximum size on a budget	Closest to natural diamond

Whichever you choose, both moissanite and lab diamonds offer extraordinary value compared to natural diamonds. At Forever For Lovee we carry both — so you can find your perfect stone without compromise.

Shop Moissanite Collection → [Here]

Shop Lab Diamond Collection → [Here]

 

FAQ SECTION:

Q1: What is the most popular moissanite shape?

Round brilliant is by far the most popular moissanite shape, accounting for the majority of engagement ring purchases. Its 58 facets are engineered for maximum brilliance and light return, making it the most versatile choice for any ring style or setting.

Q2: What size moissanite looks like a 1 carat diamond?

A 6.5mm round brilliant moissanite has a Diamond Equivalent Weight (DEW) of 1.20 carats, making it visually equivalent to a 1.20 carat natural diamond on the finger. If you specifically want a 1.00 DEW equivalent, a 6mm round moissanite (1.00 DEW) is your closest match.

Q3: What is Diamond Equivalent Weight (DEW) in moissanite?

Diamond Equivalent Weight (DEW) is the carat weight of a diamond that is the same physical size as your moissanite. Because moissanite is less dense than diamond, a moissanite stone weighs less than a diamond of the same mm dimensions. Always use DEW when comparing moissanite to diamond sizes.

Q4: Is moissanite available in all diamond shapes?

Yes. Moissanite is available in 13 shapes: round brilliant, oval, cushion, emerald, pear, radiant, marquise, heart, hearts and arrows, square brilliant, trillion, triangle, and baguette. Each shape is available in a range of sizes, making moissanite one of the most versatile gemstones available.

Q5: Does moissanite look fake compared to a diamond?

Moissanite does not look fake — but it does look different from diamond to a trained eye. Moissanite produces more colourful fire (rainbow flashes) than a diamond, which actually makes it appear more brilliant in certain lighting. To the untrained eye and in most everyday settings, moissanite and diamond are visually indistinguishable.

Q6: Which moissanite shape looks the biggest for its size?

Oval and marquise cut moissanite appear the largest for their carat weight because their elongated shape covers more surface area on the finger. An oval moissanite can appear 10–15% larger than a round moissanite of the same carat weight.

Q7: Should I choose moissanite or lab diamond for an engagement ring?

Choose moissanite if you want the largest possible stone for your budget, maximum fire and brilliance, or an ethically created stone at the most accessible price point. Choose lab diamond if you want a stone that is chemically identical to natural diamond, comes with IGI or GIA certification, and holds comparatively more resale value. Both are exceptional choices for an engagement ring.

 

Ready to Find Your Perfect Moissanite Ring?

Moissanite offers breathtaking brilliance across 13 beautiful shapes, with sizes ranging from delicate 2mm accent stones to impressive 15mm showpieces. Whether you choose a classic round brilliant for timeless elegance, an oval for a modern romantic look, or a bold trillion for something truly one of a kind — moissanite delivers exceptional beauty at a fraction of traditional diamond prices.

At Forever For Love every moissanite in our collection is carefully selected for quality, cut precision, and brilliance. We also carry a full range of IGI certified lab diamond rings for buyers who prefer the classic diamond choice.

Shop Forever For Love's full moissanite collection → Here