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Diamond education guide

Lab-Grown Diamonds

A real diamond. The lab part just describes the address.

A diamond is carbon atoms locked in a crystal. The crystal does not care whether that happened under a mountain over a billion years or inside a reactor over six weeks. Same atoms, same structure, same hardness, same fire. A jeweller's loupe cannot tell them apart, and a diamond tester reads both as diamond.

A useful comparison: ice from your freezer versus ice from a glacier. One took an age, one took a machine, and both are simply ice. This is not farmed versus wild salmon, where the product genuinely differs - it is the same product with a shorter story.

The honest caveat: lab-grown prices have fallen over the years and may keep falling. If you are buying a diamond as an investment, buy something else. If you are buying something beautiful to wear for decades, this is the same stone for a fraction of the price.

Shop lab-grown diamond jewellery ->

The 4Cs, Clearly

Four grades on the report. Your eye only sees two of them.

Cut is how well the stone was shaped, and it is the only C you can see across a room. A well-cut diamond throws light back at you; a poorly cut one leaks it out the bottom. If you remember one thing from this page: never compromise on cut.

Colour runs from D (colourless) downward. The difference between D and F is invisible outside a grading lab; around H or I, a warm tint starts to show, especially set in white gold. Clarity measures internal flaws: VVS means a trained grader with a microscope struggles to find them, SI means you might spot one yourself. Between those grades sits a lot of price and very little visible difference.

Carat is weight, not size. A deep-cut stone can weigh more and look smaller. We keep our stones in E-F colour and VVS clarity (VVS-VS for select diamonds under 0.50 ct) so the two invisible Cs are never a real question - which leaves you free to choose on the two you can actually see: cut and carat presence.

Carat vs karat, explained ->

The IGI Standard

A stone without a report is a story you take on faith.

An IGI certificate is an independent laboratory's record of exactly what you bought: cut grade, colour, clarity, and carat weight, measured by people with no stake in the sale. "Certified by the seller" is not certification - it is marketing.

Every Carat Theory centre stone of about 0.50 ct and above carries its own IGI report, and the report number is laser-inscribed on the stone's girdle. You can type that number into IGI's website and verify your diamond in about thirty seconds.

Independent grading is the difference between a specification and a promise. It also matters later: for insurance, for resizing, for any future jeweller who needs to know exactly what they are working with.

Browse certified pieces ->

Hallmarking

The stamp that proves the gold is what we said it is.

Solid 14K gold is 58.3% pure gold, alloyed with other metals for the strength daily wear demands. A hallmark is the small stamp inside a ring band or on a clasp that certifies that standard.

Why it matters: the word "gold" on a listing can legally mean plated, vermeil, or filled - a layer of gold measured in microns over brass or steel. Those finishes wear through. A hallmark on solid gold is the difference you can check, not just believe.

Browse our 14K gold pieces ->

Diamond Shapes

Shape is personality - and it quietly changes price and presence too.

Round brilliants sparkle hardest and cost the most per carat, because cutting one wastes the most rough diamond. Ovals, pears, and marquises face up larger than a round of the same weight, so they read bigger on the hand for the same money.

Emerald cuts trade sparkle for long, calm flashes of light - but that open window hides nothing, so clarity matters more there than anywhere else. Cushions and princess cuts sit in between: plenty of fire, gentler pricing.

None of this makes one shape better. Round is timeless, ovals lengthen the finger, emerald is architecture. Pick the one that stops your eye, then let the numbers follow.

Explore shapes in our collection ->

Pricing Explained

Fewer hands between the stone and you.

A mined diamond typically passes through a miner, a rough dealer, a cutter, a wholesaler, and a retailer before it reaches a showcase - and each of them adds a margin. A lab-grown stone skips the front half of that chain, and buying direct online skips most of the back half.

That is the whole trick. Nothing about the stone is cheaper - the route is shorter. Our Price Bridge lays the comparison out with real numbers.

Read the Price Bridge ->

Care Guide

The diamond is forever. The setting lives a human life.

Diamonds are the hardest natural material on earth, but the gold holding them is not. Warm water, a drop of mild soap, and a soft toothbrush is the entire cleaning routine - no special products required.

Take pieces off for the gym, the pool, and household cleaning. Store each piece separately: a diamond will scratch anything it shares a pouch with, including your other jewellery.

Every few months, check that stones sit snug in their settings. Prongs loosen slowly, not suddenly - a thirty-second check is how you catch it early.

Have a care question? Contact us ->

Ethical Sourcing

Fewer unknowns. That is the honest claim.

Lab-grown diamonds remove the questions that follow some mined stones: no habitat disruption, no conflict origins, and a chain of custody short enough to actually trace.

We will not overclaim the rest. Growing diamonds takes real energy, and the footprint varies by producer. What we can say honestly is this: fewer unknowns, a shorter supply chain, and a stone whose story we can vouch for from reactor to setting.

Our sourcing philosophy ->