Loose Lab-Grown Diamonds

Yes — chemically, optically, and physically. A lab-grown diamond is crystallized carbon at Mohs 10 with the same brilliance, fire, and hardness as a mined stone; gemological labs grade both on the identical 4Cs scale. The only differences are origin and price. Our lab-grown vs natural comparison covers where the two genuinely diverge — and where they don't. Even professional diamond testers read them as diamond, because every property the instrument measures is identical.

Each certificate documents the stone's cut grade, color, clarity, carat weight, precise millimeter measurements, polish, symmetry, and fluorescence, plus a unique report number you can verify on IGI's site. It travels with the stone for insurance and any future resetting. For how IGI's grading compares with GIA's, see our IGI vs GIA guide. Keep the certificate with your purchase records; insurers and appraisers will ask for it first.

Because carat measures weight, and weight fills three dimensions. A well-cut 1.0 carat round faces up around 6.4mm across; a 2.0 carat reaches only about 8.1mm — roughly a quarter wider, not double. That is why every listing here prints face-up millimeter dimensions beside the carat weight, and why comparing millimeters is the smarter way to shop for visible size.

Yes — that is the intended path. Choose your certified stone, then bring it to our custom ring service for a solitaire, halo, vintage reproduction, or any design you can describe. Because the stone's exact measurements are documented before the setting is made, prongs and bezels are cut to fit it precisely rather than to a catalog average. You approve a render of the design before production begins, so nothing is committed until the setting looks right.

Two methods. HPHT presses carbon around a seed crystal at mantle-like heat and pressure; CVD grows diamond layer by layer from carbon-rich gas in a vacuum chamber. Both produce genuine diamond rough in weeks, which is then cut and polished exactly like mined material. Our guide to how lab diamonds are made explains both processes in plain language. The rough that emerges is graded and certified under exactly the same standards as mined crystal.

This collection starts from $865 for a certified 1.0 carat stone, with price rising by carat weight, cut grade, color, and clarity. As a rule of thumb, a lab-grown diamond costs a fraction of a mined stone with the same certificate numbers — our lab diamond price guide breaks down what moves the number and where the value sweet spots sit.

Match the shape to the finished ring you imagine. Rounds maximize sparkle and suit every classic setting; ovals, pears, and marquises face up larger per carat and elongate the finger; emerald and asscher cuts give long, glassy flashes and reward the high clarity lab growth makes affordable; radiants and cushions combine a rectangular outline with brilliant faceting. All eight shapes here carry IGI certificates.

Moissanite is a different mineral — silicon carbide, Mohs 9.25 — with more rainbow fire and a lower price; a lab diamond is actual diamond, harder and whiter in its light return. Both are excellent daily-wear stones; the choice is chemistry and budget. Compare finished moissanite engagement rings, and note that moissanite reads differently on testers — our tester guide explains why.

Yes. Standard thermal and electrical testers identify lab-grown stones as diamond, because they are diamond — the instruments measure physical properties, and those properties are identical to mined material. Distinguishing lab from mined requires specialized lab equipment reading growth patterns and trace elements, which is precisely what the IGI certificate documents for every stone on this page. If a tester ever reads otherwise, the stone in question is a simulant like cubic zirconia — not a lab-grown diamond.