Spec Finder

The 4 Cs, minus the lecture. Here are the exact filter settings to type into any diamond search — the combination that looks flawless to human eyes and skips every invisible upgrade.

Your answer

Set the filters to exactly this and you're buying the sweet spot: the grades below are where the visible quality plateaus and the price keeps climbing anyway. Everything above them is money spent on certificate letters nobody can see on a hand.

The copy-paste recipe

CutExcellent / Ideal

The one C you never cut. It's the sparkle dial — a poorly cut D-flawless looks like a wet ice cube.

ColorG–H

Face-up, identical to a D. Drop to I–J if the ring is yellow or rose gold (the metal warms every stone anyway).

ClarityVS2 (or SI1 on video)

"Eye-clean" is the only bar that matters. VS2 virtually always clears it; a hand-checked SI1 is the value play.

CaratBuy shy: 0.9 / 1.4 / 1.8

Prices cliff at round numbers. 0.9 ct looks identical to 1.0 and costs meaningfully less. Spend what's left here.

Adjust for your shape

If your Step 3 shape was…

…tweak the recipe

Round

No changes. Rounds hide color and flaws best; the base recipe is built for them. Bonus: rounds have official cut grades, so "Excellent" is a real filter.

Oval, pear, marquise, radiant

Color up one grade (tips concentrate warmth) and only buy from 360° video — these shapes have no official cut grade and every one has some bow-tie shadow to judge by eye.

Emerald or asscher

Clarity VS2 minimum, color G minimum. Step cuts are display cases — big glassy facets hide nothing. This claws back some of their discount; it's the cost of sleek.

Cushion, princess, radiant

Clarity can drop to SI1–SI2 on video — these shapes shred light and hide flaws brilliantly. Put the savings into carat.

Any stone over 2 ct

Step clarity and color up one grade each — big tables magnify everything.

How to verify "eye-clean" yourself

Open the stone's 360° video and zoom out to actual size (about a centimeter on screen). If nothing jumps out, it's eye-clean — whatever the grade letter says.
Prefer white feathers near the edge (they hide under prongs) over anything dark under the center table.
Skip SI stones whose certificate says "clarity grade based on clouds" — that can mean an overall hazy look.
Certificate must be GIA or IGI, verifiable on the lab's website. No cert, no sale — see the Red Flags list.

Where the savings go: dropping from "max everything" to this recipe routinely cuts 30–50% off the stone — which is a full carat tier, the entire setting, or the honeymoon upgrade. The recipe isn't cheap-ing out; it's refusing to pay for invisibility.

Where to do this step

The shops that make this part easy:

Rare Carat

The price-comparison engine — pulls stones from dozens of vendors so you see the whole market.

Visit Rare Carat →

James Allen

360° HD video of every stone — the place to eyeball the exact diamond before money moves.

Visit James Allen →

Blue Nile

The biggest certified inventory online and frequent sales — the default first stop for most buyers.

Visit Blue Nile →

Ad disclosure: some links on this page are affiliate links — we may earn a commission if you buy through them, at no cost to you. It never changes which option we point you to.

→Next — Step 5 of 7

Setting Finder

Her lifestyle picks the setting. Here's the match.