Can I buy a round engagement ring here?

You can buy the center diamond. The mounting is made or supplied by a jeweler. That is how these listings stay tied to one certified stone.

Lab-grown or natural round?

Both are on this page until you filter type. Lab-grown costs less at the same grades. Natural is the mined stone.

Round center diamonds

Round brilliants are the diamond most people picture: a circular outline cut to throw light back through the crown. This page is the center stone for a round engagement ring, not a finished ring.

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Put cut first. An Excellent or Ideal round looks brighter than a Fair cut of the same carat, even if color and clarity are a grade higher on the duller stone. After you choose the diamond, a jeweler sets it. Carat Mate ships the certified loose stone and its lab report.

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

Can I buy a round engagement ring here?: You can buy the center diamond. The mounting is made or supplied by a jeweler. That is how these listings stay tied to one certified stone.
Lab-grown or natural round?: Both are on this page until you filter type. Lab-grown costs less at the same grades. Natural is the mined stone.