The 4Cs — cut, colour, clarity and carat — are how every diamond is graded, but they are not equally important. Two of them decide how the diamond actually looks; two mostly decide what you pay. Here is what each one does, in plain language, and where your money is best spent.
Key takeaways
- Cut matters most — it is the only C that determines how much a diamond sparkles.
- Carat is weight, not size — and weight scales faster than the face-up look.
- Colour and clarity mostly affect price; beyond a point the difference is invisible.
- Spend order: cut, then carat, then colour and clarity.
- Montare fixes all four high: Triple Excellent, 3ct minimum, D–E, VVS1–VVS2, IGI certified.
Cut — the only C that changes how the diamond looks
Cut is the proportions of the stone, not its shape. It is how the facets are angled relative to each other so that light entering the table reflects back to the eye rather than leaking out the side. Triple Excellent means a diamond is graded Excellent in cut, polish and symmetry by the IGI — the strictest combination. A perfectly cut diamond is brighter than a poorly cut diamond of any size or colour. We explain the grades in full in Triple Excellent cut, explained. (Shape — round, oval, cushion — is a separate decision; see our visual guide to diamond shapes.)
Every Montare diamond is Triple Excellent. We will not sell below it.
Colour — D through Z
D is colourless; Z is light yellow. Most retail diamonds sit in the middle (G–J). Montare's floor is D or E — the top two grades, where no colour is detectable even to a trained eye. Beyond that, the difference is academic.
Clarity — the inclusions inside
Clarity grades the number, size and position of inclusions inside the stone. VVS1 means very, very slightly included — inclusions are extremely difficult to see even under 10x magnification. VVS1–VVS2 is Montare's floor. To the naked eye, the diamond is flawless.
Carat — weight, not size
Carats measure weight. A 3-carat round brilliant is roughly 9.4mm across the top; a 4-carat about 10.4mm. Carat weight scales faster than visual size — doubling the weight does not double the look. We set the floor at 3 carats because below that, the stone reads small on most hands; more on that in why three carats.
Where to spend: the priority order
| The C | What it affects | Priority |
|---|---|---|
| Cut | How much it sparkles | Spend here first |
| Carat | Visual size and presence | Then here |
| Colour | Mostly price; invisible at D–G | Hold at the floor |
| Clarity | Mostly price; eye-clean at VS+ | Hold at the floor |
What we wish more buyers knew
Going from VVS1 to VVS2 saves you 15–20% with no visible difference. Going from D to E saves another 8–12%. Dropping cut from Triple Excellent to merely Very Good saves you nothing worth having, because you will not love the diamond. Spend on cut, then carat, then think about colour and clarity.
Why Montare
Rather than ask you to trade the 4Cs against each other, we fix them at a floor and build from there — lab-grown, D–E, VVS1–VVS2, Triple Excellent, 3 carats minimum, IGI certified. Lab-grown is what makes a floor that high attainable; here is the arithmetic behind the price. Build and price a ring to the standard in our ring builder.
Frequently asked questions
Which of the 4Cs is most important?
Cut. It is the only C that determines how much a diamond returns light and sparkles — a top-cut smaller diamond outshines a poorly cut larger one.
What is the best diamond colour for value?
D–E look icy and colourless; G–H still face up white for less. Montare holds D–E as the floor so there is never a visible colour question.
What clarity is eye-clean?
VS and above are typically eye-clean; VVS1–VVS2 (Montare's floor) are flawless to the naked eye and very hard to fault even under 10x.
Does a bigger carat always look bigger?
Not proportionally — carat is weight. Cut and shape affect face-up size too, so an elongated shape can look larger than its weight suggests.
Ready to choose? Build a ring to the Montare standard in the ring builder, or book a consultation.