Affordable Diamond Engagement
Rings & Fine Jewelry - Up to
70% Less Than Retail

Certified Lab Grown Diamonds from New York's Diamond District

A lab grown diamond is a real diamond. Same crystallized carbon, same 10 on the Mohs scale, same fire when it catches the light, grown in a lab over weeks instead of pulled out of the ground.

Precious Carbon is a New York diamond house in the heart of Manhattan's Diamond District. We sell certified lab grown and natural diamonds, engagement rings, wedding bands and fine jewelry, and we sell them to you directly. No showroom chain, no middleman, no markup stacked on a markup.

Every diamond arrives with an IGI or GIA grading report and a laser inscription on the girdle, so the stone in your hand is probably the stone on the certificate. Filter by shape, carat, color and clarity. See any setting in 3D before you commit. Or talk it through with a diamond expert over video, free, any day of the week.

Custom design costs nothing extra, and you approve a 3D rendering before we make anything.

What we sell	Certified lab grown and natural diamonds, engagement rings, wedding bands, fine jewelry
Certification	An IGI or GIA report and a matching laser inscription on every center stone
Consultations	Free video appointments, seven days a week
Custom design	Free, with a 3D rendering you approve before production
Production	Custom rings 4–5 weeks · Quick Ship rings 7–15 days
Returns	30 days · Warranty: lifetime on manufacturing defects · Resizing: free for 90 days from delivery

Shop Lab Grown Diamonds by Shape

Shape decides a diamond's character, and how big it looks for the weight you're paying for. Two stones at the same carat can read completely differently on a hand.

• Round: The most brilliance of any cut, and the one that never dates. Shop Round Lab Diamonds.
• Oval: Stretches the finger and faces up larger per carat than a round.
• Pear: A teardrop: rounded at one end, pointed at the other.
• Emerald: Long step-cut facets and clean architectural lines.
• Cushion: Rounded corners and a soft, slightly vintage outline.
• Princess: A sharp-cornered square. Modern, geometric, unfussy.
• Radiant: Clipped corners with brilliant faceting underneath, so it stays bright in low light.
• Marquise: Two points and a long body. Covers more finger than any other shape at the same weight.
• Asscher: A clipped-corner step cut with that hall-of-mirrors depth.
• Heart: Two lobes and a point, and it lives or dies on symmetry.

Shop Lab Grown Diamonds by Carat

This is where lab grown diamond changes the math. The same budget that buys one carat mined will usually buy two or three grown, so pick the size you actually want and work from there.

• 1 Carat Lab Grown Diamond: This is the benchmark, and about 6.5mm across in a round.
• 2 Carat Lab Grown Diamond: A best and clear step up on the hand, and still supplies an everyday ring in 2 carat lab grown diamond.
• 3 Carat Lab Grown Diamond: This is the statement stone, and looks best with a simple band under it.
• 4 Carat Lab Grown Diamond: A large-format sparkle, and check finger coverage before you commit.
• 5 Carat Lab Grown Diamond: Maximum presence, and best protected in a bezel or cathedral setting.

Engagement Ring Styles

The setting decides how a ring actually lives: how high the stone sits, how much it catches, how often it needs looking at.

• Solitaire: It’s just one diamond, nothing competing with it.
• Halo: Small diamonds ringing the center stone to make it read larger.
• Pavé: A band set with tiny diamonds, so it sparkles the whole way round.
• Hidden Halo: The same trick, tucked underneath, visible only in profile.
• Three-Stone: Past, present and future, in three matched diamonds.
• Side-Stone: Accent diamonds either side for extra width and light.
• Vintage: Milgrain, engraving and detail work, for a ring that looks inherited.
• Bezel: A metal rim around the stone. The most secure setting, and the one that never snags.
• Nature-Inspired: Vines, leaves and organic bands.
• Toi et Moi: Two stones side by side, one for each of you.
• Unique: Asymmetric, one-off designs for anyone who doesn't want the obvious.

Nothing here quite right? Design your own engagement ring around any stone in the collection.

What’s the Difference between Lab Grown vs Natural Diamonds?

Both are real diamonds. Identical chemistry, identical crystal structure, identical hardness, and a standard diamond tester reads both as diamond, because that's what they both are.

What separates them is origin and price. One formed underground over a geological age and was mined. The other was grown in a reactor over a few weeks. The second one costs a fraction of the first.

Feature	Lab grown	Natural
What it is	A real diamond grown in a laboratory	A real diamond formed underground and mined
Hardness	10 on the Mohs scale	10 on the Mohs scale
Chemical composition	Crystallized carbon	Crystallized carbon
Certification	IGI or GIA	GIA or IGI
Price (1ct oval, G, VS1)	$389	$5,316
Resale value	Generally lower	Generally higher, not guaranteed
Sourcing	No mining required	Mined; provenance standards vary

On resale: it depends on the individual stone and the offer in front of you, not on origin by itself. Neither is an investment. Read the full lab grown vs natural diamonds comparison.

Design Your Own Diamond Engagement Ring

Three steps, with a diamond expert on hand at each one.

1. Choose your setting: Start with style, metal and band width.
2. Choose your diamond: Compare shape, carat, color, clarity and cut grade side by side.
3. Add free engraving: A date, initials, or a line only the two of you will understand.

You see a free 3D rendering and approve it before anything goes into production. Additionally, with Precious Carbon, custom rings ship in 4–5 weeks, and quick ship rings in 7–15 days.

Why Couples Choose Precious Carbon

• No middleman: You're buying from the diamond house directly, not from a chain that bought from someone who bought from us.
• Certified and laser-inscribed: Every center stone ships with an IGI or GIA report and a matching inscription on the girdle.
• Free custom design: IGI or GIA certified diamonds set into any design you want, with no design fee.
• Lifetime manufacturing warranty: Manufacturing defects are covered for life, including a setting fault that lets a stone work loose.
• Free resizing for 90 days: This starts from the date your ring is delivered.
• Price match guarantee: Found the same lab grown diamond engagement ring cheaper?
• Experts seven days a week: Call, chat, or book a free video appointment any day of the week.

Lab Grown Diamond Jewelry Beyond the Ring

The same quality of lab grown diamond jewelry goes into the rest of the collection, so a ring can be matched to studs, a pendant or a band without the stones looking like they came from somewhere else.

• Women's wedding bands: Matching, curved and eternity styles
• Men's wedding bands: Plain, brushed and diamond-set.
• Diamond earrings: Studs, halos and hoops.
• Pendants and necklaces: Solitaire, halo and station styles.
• Bracelets: Tennis, bangles and in-line.
• Initial pendants: A diamond-set letter, A to Z.

Shipping, Returns and Payment

Every order ships free and fully insured within the US. You have 30 days to return an unworn ring for a refund, resizing is free for 90 days from delivery, and manufacturing defects are covered by a lifetime warranty.

Klarna splits your payment from 0% APR, and flexible payment plans are available across the range, not just on the larger stones.

Custom rings ship in 4–5 weeks. Quick Ship rings arrive in 7–15 days.

Want to talk to someone before you order? Book a free video consultation with a diamond expert.

All About Diamond Buying Guides with Precious Carbon

Worth ten minutes before you choose a stone.

• The 4Cs of Diamonds: How cut, color, clarity and carat set the price.
• Diamond Clarity: What VS1, VVS2 and SI1 actually look like on a hand.
• Diamond Certification: How to read an IGI or GIA report and verify the inscription.
• Engagement Ring Guide: Settings, metals, budgets, and how to buy without guessing.
• Ring Size Chart: Measure at home and convert between US and international sizes.