Why Millimeter (MM) Size Is More Important Than Carat Weight?

Most first-time diamond buyers focus solely on carat weight, assuming it represents the diamond's size. But here’s the truth: carat = weight, while millimeter (mm) size = how big your diamond actually looks.

For example:

• A 1-carat round-cut diamond typically measures 6.4mm

• But a 1-carat oval cut looks longer at 7.7mm x 5.7mm

• Two diamonds with the same carat weight can look very different in size, depending on the cut and depth

When shopping for a solitaire, especially online or custom-made, always ask for the actual millimeter dimensions, not just the carat weight.

❓ Frequently Asked Questions (FAQs)

What is the size of a 1-carat diamond in mm?

A 1-carat round-cut diamond typically measures 6.4mm – 6.5mm in diameter. Other shapes, like oval or pear, may appear larger due to their elongated dimensions.

What is the mm size of a 2-carat round diamond?

A 2-carat round diamond measures approximately 8.1mm – 8.2mm in diameter.

Is a 1.5-carat stone much bigger than 1 1-carat?

Yes. While 1.5 carat diamonds are only 50% heavier by weight, they can appear up to 15–20% larger depending on the cut. For example, a 1.5 carat round is ~7.4mm, compared to 6.4mm for a 1 carat.

Do all 1-carat diamonds look the same size?

No. The cut greatly affects the visible size. A deep-cut diamond may weigh 1 carat but appear smaller than a shallow-cut one. Always check the millimeter (mm)  dimensions to know the face-up size.

Which diamond cut looks biggest for 1 carat?

Oval, pear, and marquise cuts generally look larger than round or asscher cuts of the same weight due to their stretched surface area.

How can I make my 1-carat solitaire look bigger?

Opt for:

• Oval or pear-shaped diamonds

• Thin, minimal settings

• Halo designs that add visual size

• Choose a diamond with a larger mm face-up area rather than just focusing on carat

Are millimeter (mm)  measurements the same for lab-grown diamonds?

Yes. Lab-grown diamonds have the same physical properties as mined diamonds, so their mm dimensions match exactly for the same carat and cut.

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