How big is a 1 carat diamond?

A round near the middle of this page is about 6.4 mm across for a round near 1.00 ct. Oval, pear, and marquise look longer at the same weight.

1 carat lab-grown diamonds

This is the most searched diamond weight. Listings here sit around 1 carat (0.90–1.10 ct), not the whole 1-to-2 range. A round in this range is about 6.4 mm across for a round near 1.00 ct.

Selected0.90 ct – 1.10 ctHas photo

Searching diamonds…

Filters on this page stay inside 0.90–1.10 ct and lab-grown origin. Narrow further by shape, color, clarity, and cut. Each result is one certified stone, not a price band.

Carat Mate lists certified loose diamonds for shoppers in the United States, Canada, the UAE, London, and Australia. Prices are in USD everywhere. We ship to the United States, Canada, the UAE, London, and Australia.

Questions

How big is a 1 carat diamond?: A round near the middle of this page is about 6.4 mm across for a round near 1.00 ct. Oval, pear, and marquise look longer at the same weight.
Why is the range 0.90–1.10 ct?: This is the most searched diamond weight. Listings here sit around 1 carat (0.90–1.10 ct), not the whole 1-to-2 range.