how to choose a diamond: the 4cs (and what actually matters)

choosing a diamond can feel unnecessarily complicated.

cut, color, clarity, carat weight, ratios, percentages, grading reports... there are a lot of numbers involved in buying something that ultimately comes down to one very simple question:

do you love it?

the 4cs (cut, color, clarity and carat) are a great place to start. they give us a common language for comparing diamonds and understanding what we're looking at.

but they aren't a formula for beauty.

two diamonds can look nearly identical on paper and completely different in person. and sometimes the diamond that technically scores "better" isn't the one you'd choose.

here's how we think about the 4cs, and how to use them to find your diamond.

cut

if there's one c we'd pay especially close attention to, it's cut.

cut determines how a diamond interacts with light — how much it sparkles, where you see flashes of brightness and darkness, and ultimately how alive it feels when it moves.

but here's where things get a little confusing: cut isn't the same thing as shape.

oval, round, emerald, cushion, pear, marquise, moval, hexagon and rhombus describe a diamond's shape. its cut refers more broadly to its proportions and facet arrangement.

and there isn't necessarily one "best" facet pattern.

a modern brilliant cut might give you tons of tiny flashes and sparkle, while an antique-inspired cut can produce fewer, broader flashes of light. a step-cut diamond creates an entirely different effect with long, mirrored facets.

none of these is inherently better.

they're different personalities.

this becomes especially important when you're looking at unusual or custom-cut diamonds. the numbers on a grading report can help us evaluate a stone, but they can't completely describe what your eye sees.

we look at things like symmetry, facet pattern, light return, bow ties, windowing, depth and face up spread - but ultimately, a beautiful diamond should look beautiful.

color

this might be our favorite c to break the rules on.

traditional diamond grading taught generations of shoppers that the closer a diamond gets to completely colorless, the "better" it is.

the GIA d-to-z scale begins with d, representing colorless diamonds, and progresses through increasingly noticeable shades of yellow or brown.

and yes, a beautiful d-color diamond can be incredible.

but d color isn't automatically the most desirable diamond anymore — because not everyone is looking for colorless.

champagne diamonds are the perfect example.

warm diamonds that might once have been viewed primarily through the lens of how far they were from colorless are now sought out specifically because of their color.

creamy beige. pale champagne. warm honey. golden brown. caramel. cognac.

for the right person, those tones aren't something to minimize.

they're the entire reason to choose the diamond.

that's why we think color is much more subjective than the traditional hierarchy makes it seem.

some people want an icy-white diamond. some prefer just enough warmth to soften it. others want a diamond that is unapologetically golden, champagne or brown.

even within champagne diamonds, there isn't one "best" shade. undertones matter, too. one stone might lean golden while another feels peachy, creamy, smoky or deep brown.

the question isn't simply:

"what color grade is best?"

it's:

"what color do i love?"

and that's a much more interesting question.

clarity

clarity describes the internal and external characteristics of a diamond - commonly called inclusions and blemishes.

grades generally range from flawless down through included diamonds.

but this is another place where we don't necessarily believe you need to chase the highest grade on the report.

a flawless diamond is technically impressive, but you're probably not going to walk around examining your ring under 10x magnification.

what matters to most people is whether the diamond looks beautiful to the naked eye.

an eye clean VS1 diamond can look virtually identical to a flawless diamond when you're actually wearing it - despite potentially having a very different price.

the type and location of an inclusion can matter just as much as the clarity grade itself. a small inclusion hidden near the edge of a diamond may be much less noticeable than one sitting directly beneath the table.

and certain cuts show inclusions more readily than others. step cuts like emeralds and asschers tend to have large, open facets that can make inclusions easier to see, while brilliant facet patterns may disguise them more effectively.

so rather than automatically searching for the highest clarity grade available, we ask:

can you see the inclusion, does it affect the diamond's beauty or durability, and do you care?

if the answers are no, no and no, you may be paying for something you'll never actually see.

carat

carat is probably the most misunderstood of the 4cs.

carat measures weight, not physical size.

two 2 carat diamonds can have noticeably different face up dimensions depending on their shape, proportions and depth.

a deeper diamond can carry more of its weight vertically, where you'll never see it once you're looking straight down at the stone. a shallower or more efficiently proportioned diamond may appear larger from the top at exactly the same carat weight.

shape matters too.

elongated shapes such as ovals, marquises and pears can often create more visual finger coverage than more compact shapes of the same weight.

this is why we always look at a diamond's actual measurements alongside its carat weight.

if your goal is a certain visual presence, saying "i want something around 11 x 8 mm" can sometimes be much more useful than simply saying "i want a 3-carat diamond."

don't buy the number.

buy the diamond.

so... which of the 4cs matters most?

there isn't one answer for everyone.

if sparkle is everything to you, cut and light performance may be your priority.

if you want a large visual presence, dimensions and carat distribution might matter more.

if you love crisp, glassy step cuts, you may want to prioritize clarity (this is generally our top pick).

and if you've been dreaming about a honey-colored champagne diamond, traditional ideas about getting as close to d color as possible are basically irrelevant.

the point isn't to maximize every grade.

the point is to decide which characteristics matter to you — and spend your money there.

the grading report isn't the diamond

we love a grading report.

we also don't think you should marry one.

certificates and grading reports are incredibly useful tools for understanding what you're buying. they can tell us measurements, proportions, color and clarity grades, treatments and other important characteristics.

but they cannot fully capture personality.

they can't tell you that one champagne diamond has exactly the creamy honey undertone you've been searching for.

they can't completely communicate the chunky flashes of an antique cut.

they can't tell you why one slightly imperfect diamond makes you feel something and another technically "better" diamond doesn't.

diamonds aren't spreadsheets.

and that's kind of the point.

how we choose diamonds

at not your mom's diamonds, we're interested in the stones that make you look twice.

sometimes that's an exceptionally cut colorless diamond.

sometimes it's an unusual antique facet pattern.

sometimes it's a shape you've never seen before.

and, unsurprisingly, sometimes it's a warm champagne diamond that breaks practically every traditional rule you thought you were supposed to follow. 🥂

we look at the 4cs, but we also look beyond them - at proportions, dimensions, facet patterns, undertones, light performance and the overall personality of the stone.

because the goal isn't to find the diamond with the "best" grades.

it's to find the diamond you can't stop thinking about.

choosing your diamond

start with the 4cs.

then forget about finding the diamond you're supposed to want.

figure out what catches your eye.

save photos. notice whether you gravitate toward elongated shapes or chunky antique facets. compare icy whites with warmer stones. look at champagne, honey and cognac tones. decide whether you love perfect symmetry or something a little unexpected.

and if the diamond you're imagining doesn't seem to exist?

that's where custom comes in.

at not your mom's diamonds, we source unique diamonds, hunt down unusual colors and shapes, and create custom-cut stones and bespoke jewelry around what you actually want.

because choosing a diamond shouldn't be about checking four boxes.

it should be about finding (or creating) the perfect diamond for you💎