Can I buy a marquise 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 marquise?

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

Marquise center diamonds

Marquise diamonds are long, with points at both ends. They have the largest face-up length of the common shapes at a given carat. This page is the center stone for a marquise engagement ring, not a finished ring.

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Both points need protection in the setting. Asymmetry between the points is the usual flaw; the outline should be even. 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 marquise 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 marquise?: Both are on this page until you filter type. Lab-grown costs less at the same grades. Natural is the mined stone.