Field Notes 1.4 — On Natural & Lab-grown Diamonds
15 June 2026
On natural and lab-grown diamonds, and why GU uses both — openly
When a client asks about diamonds, the question almost always contains another question inside it.
Is natural better? Is lab-grown lesser? Does the choice say something about what I value, or what I am willing to spend?
These are honest questions. They deserve a direct answer.
A natural diamond was formed between one and three billion years ago, under conditions of heat and pressure that are, in every meaningful sense, unrepeatable. It was carried to the surface, found, cut, and eventually placed in a jeweller's hand — and then yours. That history is real, and for some people it matters. The origin is part of what the stone carries.
A lab-grown diamond is chemically and visually identical to natural. The same crystal structure, the same hardness, the same light. A gemologist with a standard loupe cannot tell them apart; only specialist equipment can. What a lab-grown diamond does not carry is the geological timeline. What it does carry is the same fire, the same presence, and a price point that often allows a larger or higher-quality stone for the same budget.
Gǔ offers both. Neither with apology. Neither with an argument.
The choice — always — belongs to the client.
What the Atelier holds firmly is how each is selected. A diamond's certificate matters; the stone matters more. Every stone is chosen for character: the way light moves through it, the personality of its cut, whether it reads as alive or merely correct. A well-chosen lab-grown diamond will outperform a poorly-chosen natural one in every way a wearer notices. The reverse is equally true.
What I am less interested in is the marketing story that has grown up around both — the mythology that natural is always superior, or the counter-mythology that lab-grown is simply the ethical choice. Both framings serve the industry more than the client.
My position is simpler: both are beautiful. Both are held to the same standard of selection. The right one is the right one for the piece, the moment, and the person wearing it.
When you write to the Atelier, you will be asked which you are considering. If you are unsure, that conversation is part of what the Inquiry is for.
The diamond conversation at GU tends to be shorter than clients expect.
We are not going to spend two hours walking you through grades. The time we spend together is on design — the piece, the story, the meaning it will carry. The diamond matters, but the Atelier's role is not to convince you to spend more on a grade you will not see on your hand. That is not what we are here for.
Here is how we think about it.
Cut — the one thing that does not move. Cut is what makes a diamond alive. The proportions, symmetry, and polish of a well-cut stone are what move light through it correctly. All round diamonds at GU are selected at triple Excellent — Excellent for cut, symmetry, and polish. For fancy shapes, cut grading differs and is discussed during the Inquiry. This is not negotiable, regardless of budget. The sparkle people associate with a fine diamond comes entirely from the cut. A poorly-cut stone is dull whatever its colour or clarity. We start here and do not move.
Diamond Colour Chart from GIA (Gemological Institute of America)
Colour — where the eye is a poor judge. Colour is graded D through Z, D being colourless and Z being more yellow. At GU, nothing below G is offered. The difference between a D and an E is something a gemologist detects under controlled lighting — not something a client sees on her hand across a day. Because of this, the Atelier's round brilliant solitaire default is E colour for lab-grown and G for natural. Both read clean and colourless in daily wear. If you have a preference for a specific grade, write in and we work from there.
Clarity — what the stone carries inside. Clarity measures the internal characteristics of a diamond — traces of the conditions under which it grew. The Atelier's standard is VVS1 for lab-grown and VS1 for natural. Both are eye-clean — no inclusion visible without magnification. Higher grades (FL, IF) make a difference on the certificate but are invisible in the piece. Budget deciding, we work between VVS1 and VS1.
Carat — the one that is entirely yours. Size is personal and budget-dependent. The Atelier does not guide clients toward a larger stone beyond what the piece calls for. A smaller, well-cut diamond outperforms a larger, poorly-cut one in every way a wearer notices. Within the standards above, carat is your decision.
The Atelier's defaults, stated plainly: lab-grown diamonds are quoted at E colour, VVS1 clarity, triple Excellent cut. Natural diamonds at G colour, VS1 clarity, triple Excellent cut. These are the grades shown in pricing on the site, fixed for consistency. For a different specification, write to hello@gujewellery.com before placing an inquiry and we will work from your preference.
From the Atelier
