Moissanite Size Chart Guide: Choose Perfect Fit for Rings, Necklaces & Earrings

Moissanite stones are commonly offered in sizes from about 0.30 to 5.00 carats (approximately 4.5–12 mm in diameter)

If you want the classic one carat Moissanite diamond with a round stone shape, pick 6.5 mm. If you want a 1.5 carat look, go 7.5 mm, and for a 2 carat look, choose 8.0 mm.

Measure by millimeters, not carats, since moissanite is lighter than diamond and carat weight does not map one-to-one. A moissanite size chart converts millimeters to how large the stone actually appears.

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Why Millimeters is the Right Way to Choose Moissanite Diamonds

Diamonds are sold by carat, but your eyes judge size by face-up millimeters. Remember that moissanite has lower density than diamond. Therefore, a stone that measures the same across the top will weigh less.

That is why 6.5 mm moissanite looks like a 1 ct diamond. However, the carat number on moissanite might differ. You can use millimeters for the visual, and treat carats as secondary to choose the perfect moissanite diamond size.

Size Picks By Jewelry Type

1. Engagement rings, round

6.0 mm for subtle, 6.5 mm for the 1 ct look, 7.5 mm for a bolder presence, 8.0 mm for a true statement.

2. Stud earrings, round

5.0 to 5.5 mm for everyday, 6.0 to 6.5 mm for dressy, 7.0 mm if you want noticeable sparkle from a distance.

3. Pendants, round

6.0 mm keeps it minimal, 7.5 mm draws the eye without feeling heavy, 8.0 mm anchors a solitaire nicely.

Moissanite Size Chart for Detailed Analysis

You can use this table to match face-up size, approximate moissanite weight, and the Moissanite diamond look you will perceive. Values are approximate and can vary by cut depth and maker.

Stone size (mm)	Approx moissanite weight (ct)	Visual size vs diamond	Typical use notes
4.5 mm	~0.30	~0.35 ct look	Minimal ring, petite studs
5.0 mm	~0.45	~0.50 ct look	Daily studs, delicate ring
5.5 mm	~0.60	~0.65 ct look	Low-profile solitaire
6.0 mm	~0.80	~0.85–0.90 ct look	Subtle engagement size
6.5 mm	~1.00	~1.00 ct look	Classic engagement benchmark
7.0 mm	~1.25	~1.20–1.30 ct look	Noticeably larger without bulk
7.5 mm	~1.50	~1.50–1.60 ct look	Bold but practical daily wear
8.0 mm	~2.00	~2.00–2.10 ct look	Statement solitaire, pendants
8.5 mm	~2.20–2.30	~2.25 ct look	Max sparkle, check setting height
9.0 mm	~2.70–2.80	~3.00 ct look	Glam look, sturdy prongs advised
10.0 mm	~3.40–3.60	~4.00 ct look	Event-ready, not for everyone daily
11.0 mm	~4.75–5.00	~5.50 ct look	Very large, plan for balance

If you are browsing at Glazed Diamonds, check the listed millimeters on each product page to match the line above.

How To Use the Moissanite Size Chart

Pick your target look. Decide the diamond look you want, like 1 ct, 1.5 ct, or 2 ct.
Find the matching millimeter. From the table, note the mm that gives that look.
Check your finger and band. Slim bands and halos change perception. Adjust up or down 0.5 mm if needed.
Confirm with a ruler. Draw a circle with that diameter on paper, or place a coin next to a printed mm scale for a quick sense of scale.
Check availability by shape. Ovals, pears, and cushions face up differently. Match the mm length for the same presence.

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Shape Defines the Size, Here’s Why

Round is the baseline. The same rules bend by shape:

Oval: Faces up larger for the same width because of added length. A 7x5 mm oval often feels like a 1 ct round.
Pear: Similar to oval for spread, with more visual length. Point-down pears can look bigger than the mm suggests.
Cushion: Slightly deeper, so the face-up area can be a touch smaller than round at the same weight. Use mm, not carat.
Princess: Corners add width in the setting, yet face-up area vs round can feel a hair smaller per mm.

Finger Size & Setting Height

Finger size: Narrow fingers amplify size. On US size 5–6, 6.5 mm reads like a classic 1 ct. On size 7–8, 7.0 to 7.5 mm often looks balanced. Larger sizes may prefer 7.5 to 8.0 mm for similar presence.
Lifestyle: If you lift, type, or care for kids a lot, consider 6.0–7.0 mm with a low-profile setting.
Setting height: Cathedral or tall solitaires show more, but they can snag. Low baskets or bezels are sleek, with a small trade-off in perceived size.
Halos and side stones: A thin halo can add 1.0–1.5 mm of visual spread. That means a 6.0 mm center with a halo can read close to a 6.5–7.0 mm look.

Earrings and Pendant Sizing Tips

Studs

Pick based on hair length and daily wear. Short hair or updos support 6.0–6.5 mm. Longer hair often needs 6.5–7.0 mm to stand out. Screw backs help keep larger studs secure.

Pendants

Movement adds sparkle, so you can size down slightly vs rings. A 7.0–7.5 mm solitaire pendant delivers presence without feeling heavy.

Sets

If matching ring and studs, keep the ring 0.5 mm larger than each stud so the ring remains the focal point.

Common Mistakes You Should Avoid

Buying by carat only. Carat on moissanite is not the same as diamond. Millimeters tell the truth.
Ignoring bandwidth. A 2.0 mm band makes the center look bigger than a 3.0 mm band.
Skipping shape effects. Ovals and pears stretch size. Cushions might read smaller face up at the same weight.
Forgetting comfort. An 8.5–9.0 mm ring sparkles really well, but if the comfort is compromised, it will end up in the jewelry box.
Not checking prongs and metal color. Thinner claws show more stone. Yellow gold can warm near-colorless stones, white metal maximizes icy face-up.

Quick Try-At-Home Methods for Size Measurement

You might be overthinking tiny differences, and that is normal. A 0.5 mm step is a subtle change. A full 1.0 mm jump is where most people notice a real shift.

Paper circles: Draw a circle at 6.0, 6.5, 7.0, and 7.5 mm. Cut, place on your finger, and snap a photo at arm’s length.
CZ test stones: Order a low-cost CZ set by millimeter. Wear for a day to test comfort and visibility.
Phone caliper apps: Use a screen ruler to visualize diameter against a coin for reference.

Care and Longevity Notes That Affect Size Choice

Hardness and toughness support daily wear, but size still affects maintenance. Larger stones collect more fingerprints and show dust faster.

A soft brush with mild soap keeps the face-up area bright. For rings 8.0 mm and up, consider six prongs or a bezel for extra security. That way, you keep the look you chose without stress.

Final Takeaways

Use a moissanite size chart to convert the look you want into the millimeters that deliver it. If you stick to mm first, you will get the appearance you pictured, the comfort you need, and a piece you reach for every day.

Here’s a quick recap how to choose the best size of Moissanite Chart

Decide the look by millimeters.
6.5 mm round gives the 1 ct diamond presence.
7.5 mm reads like 1.5 ct, 8.0 mm reads like 2 ct.
Adjust for finger size, band width, setting height, and shape.
Use the chart, try a quick home mockup, then order with a plan.

Written By

Jignesh Vaghani

Chief Technology Officer

Jignesh Vaghani is the Chief Technology Officer at Glazed Diamonds, where he leads technological innovation in diamond operations and digital transformation. His expertise covers diamond grading systems, inventory management platforms, and e-commerce solutions for the diamond industry. Vaghani specializes in bridging traditional diamond trading with modern technology, including automated quality assessment and digital marketplace development.