Why MM Size Is More Important Than Carat Weight?

Most first-time diamond buyers focus only on carat weight, assuming it represents the size of the diamond. 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

 

So, when shopping for a solitaire, especially online or custom-made, always ask for the actual mm dimensions and not just the carat weight.

 

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❓ 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 1.5 carat much bigger than 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 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 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.

 

Want to customize a lab grown diamond solitaire in your preferred size and shape? Visit Glora Diamonds, Chennai’s trusted name in ethical, transparent, and luxurious fine jewellery.

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