How is moissanite size measured?

Moissanite is measured in millimeters (mm), not in actual carat weight like diamonds. Carat weights listed are diamond equivalents.

Does moissanite look bigger than diamonds?

Yes — moissanite has a lower density than diamond, so it appears slightly larger at the same carat equivalent.

What is the most popular moissanite size for engagement rings?

The most common size is 6.5mm (equivalent to a 1.00-carat diamond).

Which shape looks the biggest for its size?

Shapes like oval, marquise, and pear often appear larger than round cuts of the same carat size.

Is bigger always better when choosing a stone?

Not necessarily — the best size is the one that fits your style, finger shape, and lifestyle.

Moissanite Size Chart & Buying Guide

Understanding moissanite size is key to choosing the right stone for your ring, necklace, earrings, or bracelet. While moissanite is measured in millimeters, it’s often compared to diamond carat weight for reference. Use this guide to visualize sizes, compare dimensions, and choose the best moissanite size for your jewelry.

Moissanite size chart comparing carat weight to millimeter diameter with visual gemstone sizes ranging from 0.5 to 5 carats, including a reference dime and Moissanite Brilliance branding.

Which Size Is Best for Me?

Everyday wear → 0.25 – 1.00 ct (4–6.5 mm)
Engagement rings → 1.00 – 2.00 ct (6.5–8 mm)
Statement jewelry → 2.00 ct+ (8 mm+)

Cut Shapes & Size Differences

Moissanite comes in various shapes, and size perception may differ by cut: