Lab Diamonds

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About Lab Diamonds Sourcing

Lab-grown diamonds are the fastest-growing segment of the diamond trade — chemically and optically identical to mined stones, at a fraction of the price, and increasingly the default choice for engagement and fine jewellery buyers who want a bigger, cleaner stone for their budget. Sourcing them directly from growers and cutters gives manufacturers pricing control that buying through a finished-jewellery reseller simply doesn't offer.

This category is currently being built out. We don't yet have verified lab diamond suppliers listed on Jewelslly, and we'd rather say so plainly than dress up an empty shelf. If you're a lab diamond grower, cutter, or manufacturer, we'd love to have your inventory here — list your business to be among the first. In the meantime, here's a genuinely useful guide to how lab diamond sourcing works, so you're ready to buy well once listings go live.

CVD Diamonds HPHT Diamonds IGI Certified GIA Certified Round Brilliant Fancy Shapes Melee & Pavé Fancy Color Lab Diamonds

What a Lab-Grown Diamond Actually Is

A lab-grown diamond is real diamond — same crystal structure (pure carbon arranged in a cubic lattice), same hardness (10 on the Mohs scale), same fire and brilliance as a mined stone. The only difference is where it formed: underground over a billion-plus years for a natural diamond, versus a specialized lab over a matter of weeks for a lab-grown one. It is not a diamond simulant like moissanite or cubic zirconia — it's chemically the same material, verified by the same 4Cs grading system used for natural stones.

How Lab Diamonds Are Grown

CVD (Chemical Vapor Deposition)

A thin diamond seed is placed in a sealed chamber filled with carbon-rich gas; the gas is broken down and carbon atoms deposit onto the seed, building the crystal layer by layer. The dominant growth method for lab diamonds today.

HPHT (High Pressure, High Temperature)

Replicates the extreme heat and pressure conditions found deep underground, using a diamond seed and carbon source compressed under enormous pressure and heat to grow a crystal. The older of the two main methods.

HPHT as a Post-Treatment

HPHT is also sometimes used after CVD growth to improve a stone's color grade — worth knowing when evaluating a certificate that references both growth method and post-growth treatment.

The 4Cs Still Apply

Lab diamonds are graded on the same Cut, Color, Clarity, and Carat scale as natural diamonds — a GIA or IGI certificate for a lab-grown stone reads the same way as one for a natural stone, with one key difference: it will explicitly state "Laboratory Grown" on the report.

Cut: still the biggest driver of visual brilliance, exactly as with natural diamonds
Color: lab diamonds can be grown across the same D–Z range, and colorless (D-F) grades are notably more accessible in lab-grown stones than natural ones
Clarity: lab-grown diamonds are often available at higher clarity grades (VVS and above) for a lower price than an equivalent natural stone
Carat: because production cost doesn't scale the same way mining scarcity does, larger lab diamonds are dramatically more affordable per carat than natural stones of the same size

Lab-Grown vs. Natural: The Core Trade-Off

Factor	Lab-Grown Diamond	Natural Diamond
Chemical composition	Identical (pure carbon)	Identical (pure carbon)
Formation time	Weeks	1–3 billion years
Typical price vs. equivalent natural stone	30–85% lower, depending on size and grade	Baseline / higher
Resale value trend	Declining as production scales	Historically more stable, though also softening
Certification	GIA, IGI — explicitly marked "Laboratory Grown"	GIA, IGI, AGS

Fancy Color Lab Diamonds

One area where lab-grown diamonds have a distinct advantage is fancy color stones. Natural fancy colored diamonds (pink, blue, yellow) are exceptionally rare and priced accordingly — sometimes into the millions for larger, more saturated natural stones. Lab-grown fancy colors, produced by introducing specific elements or post-growth treatments during the growing process, offer a genuinely vivid colored diamond at a small fraction of the natural equivalent's cost, opening up a category that's otherwise inaccessible to most buyers.

Sourcing Considerations for Manufacturers

Melee for Pavé Work

Small lab-grown melee stones (typically under 0.18ct) are commonly sold in bulk parcels by total carat weight, well-suited for pavé settings in rings, pendants, and earrings at accessible price points.

Center Stones

Larger individually certified lab diamonds work well for engagement and statement pieces, where the price advantage over natural stones allows for noticeably larger carat weight at the same budget.

Consistency Across a Production Run

Because lab-grown supply isn't limited by mining scarcity, sourcing matched, consistent-quality parcels for a full production line is often more straightforward than with natural stones.

Frequently asked questions

Are You a Lab Diamond Grower or Manufacturer?

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