US guides
A round near 1.00 carat is about 6.4–6.5 mm. That is the US default center for a reason: it reads clearly on a hand without jumping to 2 carat prices.
Lab-grown stones do not carry the same US price cliff at 1.00 carat that natural stones do, but listings still cluster there. Look just under the line.
Excellent cut first on rounds. Then color and clarity you can see in the photos.
Open 1 carat lab-grown inventory and sort only after those filters are on. Carat Mate ships the certified loose diamond and its lab report to United States addresses. Prices on the site are in USD. Wrong-item returns may be considered within 3 days of delivery, subject to review.