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The science
Grown, Not Mined.
Every Signora diamond begins as a single seed of carbon — and becomes a real diamond in weeks, not billions of years. Same crystal. Same fire. No mining. This is how.
First, the fact that matters
A Lab-Grown Diamond Is a Real Diamond
Chemically, physically, and optically identical to a mined diamond. Pure carbon, arranged in the same crystal lattice, with the same hardness — a perfect 10 on the Mohs scale — and the same brilliance. Even trained gemologists need advanced instruments to tell them apart. The only difference is the birthplace: one formed in the Earth's mantle over 1–3 billion years, the other in a growth chamber over a few weeks.
Mined
Lab-Grown
Composition
Pure carbon
Pure carbon
Crystal structure
Cubic lattice
Cubic lattice
Hardness
10 Mohs
10 Mohs
Brilliance
Identical
Identical
Time to form
1–3 billion years
A few weeks
Origin
Mined from the Earth
Grown in a chamber
Certification
Graded
IGI graded
The pine rows are where a mined and a grown diamond are exactly, measurably identical.
From seed to stone
The Journey of Your Diamond
1
Stage 1
The Seed
Every lab-grown diamond starts with a tiny fragment of an existing diamond — a "seed." Thinner than a human hair in some methods, this seed is the blueprint: the crystal pattern the new diamond will follow as it grows.
2
Stage 2
The Chamber
The seed is placed in a growth chamber and surrounded by pure carbon — the same element that forms every diamond on Earth. What happens next depends on the method: intense pressure, or a carbon-rich plasma cloud.
3
Stage 3
The Growth
Atom by atom, layer by layer, carbon crystallizes onto the seed. Over roughly three to four weeks, the crystal grows — following the exact same physics that shaped diamonds in the Earth's mantle, compressed from billions of years into weeks.
4
Stage 4
The Cut
The rough diamond emerges and travels to Surat, India — the city that cuts and polishes over 90% of the world's diamonds, and our home for three generations. Master cutters shape the rough into a stone with maximum fire and brilliance.
5
Stage 5
The Certificate
Every Signora diamond is independently graded by IGI — color, cut, clarity, and carat — exactly as a mined diamond would be. Your stone arrives with its certificate. Nothing to take on faith.
The methods
HPHT and CVD — Two Paths to the Same Diamond
Science has found two ways to grow a diamond. Both produce real, certified diamonds — they simply take different routes.
HPHT
High Pressure, High Temperature
The original method, pioneered in the 1950s. It recreates the conditions of the Earth's mantle: a diamond seed and pure carbon are placed in a press that applies over 870,000 pounds per square inch at around 1,500°C. The carbon melts and crystallizes around the seed. Nature's recipe, faithfully reproduced.
~1,500°C · 870,000+ psi · days to weeksCVD
Chemical Vapor Deposition
The modern method, developed in the 1980s — and how most gem-quality lab diamonds are grown today. A wafer-thin diamond seed sits in a vacuum chamber filled with carbon-rich gas. Heated to around 900–1,200°C, the gas becomes a plasma; carbon atoms rain down onto the seed and build the diamond one atomic layer at a time.
900–1,200°C · vacuum chamber · ~3–4 weeksWhichever path your diamond took, the destination is the same: a real diamond, IGI-certified, with nothing to hide.
Why it matters
Why We Choose Grown
No mining
No earth moved, no habitats disturbed, no mining communities at risk. A diamond without a crater.
Renewable energy
Our diamonds are grown using 100% renewable energy and are certified carbon-neutral — we keep the supplier certificates on file.
Traceable origin
A mined diamond's journey can be murky. A grown diamond's origin is documented from seed to certificate.
Honest value
Growing a diamond costs less than mining one — and we pass that difference to you. Same stone, better price, made to order with almost zero waste.
The honest answers
The Questions Everyone Asks
Will it test as a real diamond?
Yes. A lab-grown diamond passes a diamond tester because it is a diamond — same thermal and electrical properties. Instruments that distinguish grown from mined look for microscopic growth patterns, not authenticity.
Will it fade, cloud, or lose sparkle over time?
No. A diamond is a diamond — the hardest known natural material. Lab-grown diamonds are just as permanent as mined ones. Yours will look the same in fifty years as the day it arrived.
Does it have resale or heirloom value?
A diamond's real value is what it means — and lab-grown prices are stabilizing as the market matures. What we would say honestly: no diamond, mined or grown, is a financial investment. Buy it to wear it, gift it, and pass it on.
Can anyone tell the difference?
Not by looking — not even a jeweler with a loupe. Only specialized laboratory instruments can identify growth patterns. On your finger, the answer is simply: no.
Why is it so much less expensive than mined?
No mining operation, no long supply chain of middlemen. You are paying for the diamond — not the excavation. At Signora you also buy directly from the maker, which removes the retail markup on top.
Grown anywhere. Perfected in Surat.
Where Science Meets Three Generations of Craft
A grown diamond still needs a master's hands. Every Signora stone is cut and polished in Surat, India — the city behind over 90% of the world's diamond cutting, and our family's home in the trade for three generations. The science gives us the stone. The craft gives it fire.
Read our story →
See them for yourself
Diamonds With Nothing to Hide
Every piece made to order in solid gold, with an IGI certificate in the box.
