Search for "coloured diamond price" and you land on auction records. Millions of dollars per carat. Those figures are real. They have nothing to do with the ring you are about to buy. A natural coloured diamond and a lab grown coloured diamond are two unrelated markets. Here is what a blue, green, pink or yellow lab grown diamond actually costs, and why colour pushes the price up when you were taught the opposite.

Two markets with nothing in common

A natural coloured diamond is a geological anomaly. Fewer than one mined stone in ten thousand shows a clear colour. An intense natural pink runs into tens of thousands of euros per carat, often far more. Those stones go to auction, not to a shop window.

A lab grown coloured diamond is a stone produced in a reactor, with the colour under control. Same chemical composition, same hardness, same crystal structure. The difference is not in the stone. It is in how available it is.

So the two markets do not compare. Measuring a lab grown pink against a natural pink makes no more sense than measuring a garden rose against a rare orchid. They are different objects with different price logic.

The figure worth holding on to is simple. Over the past decade, lab grown diamond prices have fallen sharply, because production capacity has exploded. What cost a fortune ten years ago is affordable today. That fall is real and it is not over.

Why a lab grown coloured diamond costs more than a white one

This is the point that surprises everybody. In ordinary mined diamonds, a yellowish tint is a flaw. The more a stone leans yellow, the less it is worth. The D to Z scale exists for exactly that.

In a laboratory the logic reverses. A clear, even colour is harder to achieve than a colourless stone.

Why? Because a diamond's colour comes from the controlled introduction of elements into the crystal lattice, or from treatments after growth. Blue comes from boron. Yellow comes from nitrogen. Pink and green need further steps. Every step adds time, cost and the risk of failure. A stone whose tint is uneven is scrapped.

The practical consequence: at equal weight and quality, a lab grown coloured diamond costs more than a lab grown white one. That is the exact opposite of what the mined diamond trade taught the public for a century.

Price colour by colour: blue, green, pink, yellow

Not all colours are equal, in difficulty or in price. Here is the order of complexity, from simplest to most demanding.

Yellow. The most accessible colour. Nitrogen integrates easily and the tint is well controlled. A lab grown yellow is often the first step towards a coloured stone.

Blue. Boron gives very pure blues. The difficulty is dosage. Too little and the stone looks grey, too much and it turns dark. A light sky blue is harder to achieve than a deep blue.

Pink. More demanding. Pink does not come from a single added element, it requires an extra intervention on the structure of the stone. Deeply saturated pinks stay rare, even in a laboratory.

Green. The most temperamental of the four. Green is unstable and tends to concentrate at the surface rather than run through the stone. An even green in depth is genuine work.

In practice, in a finished ring, those differences in difficulty flatten out. At Lauredi, a ring set with a blue, green, pink or yellow lab grown diamond costs the same as one with a comparable white diamond. We made that choice for a simple reason: we do not want a customer giving up the colour she loves over a few dozen euros.

The four criteria that really set the price

For a coloured stone, the famous 4Cs of white diamonds do not apply in the same way. What matters changes order.

Saturation, first. That is the intensity of the colour. Certificates grade it in steps, from Faint to Fancy Vivid. A Fancy Vivid costs several times what a Fancy Light of the same weight costs. It is criterion number one, far ahead of the rest.

Evenness, next. A stone whose colour concentrates in one zone looks patchy under certain lights. No certificate grades this clearly. You have to look at the stone.

Weight. It counts, but less than people think on a coloured stone. A small, deeply saturated stone beats a large pale one, to the eye and on the price tag.

Clarity. The least important criterion here. On a coloured stone the tint masks a good share of the inclusions. Paying for high clarity on a deeply coloured diamond usually means paying for something nobody will see.

A word on certification. Our lab grown diamonds are IGI certified. The certificate states the origin of the stone and its colour. No consumer device can tell a lab grown diamond from a mined one. We covered that point in our article on identifying a lab grown diamond.

Why the price of the ring is not the price of the stone

This is the most common confusion. You read a price per carat somewhere, you multiply, and you cannot understand the gap with the price of a finished ring.

In a ring, the stone is rarely the heaviest line. There is also the metal, and metal has a price that moves every day. There is workshop time, counted in hours. There is hallmarking, quality control, the guarantee and after sales service.

A telling example from our own catalogue. The same piece, same stone, same shape: 190 € in rhodium plated 925 silver, 645 € in recycled 18 carat gold. The gap is not the stone. It is the metal and the time it takes to work it.

So when you compare two quotes, compare at equal metal. A ring described as "0.50 carat diamond" at 800 € and another at 2,400 € are probably not talking about the same metal or the same setting. Our article on the 750 hallmark on 18 carat gold explains what the fineness guarantees. That hallmarking system, with its French eagle head mark, is specific to France, so the marks you find will differ depending on where a piece was made.

What a lab grown diamond is worth on resale

We are not going to dodge the question.

A lab grown diamond does not resell well. The second hand market for these stones is narrow, and new prices are falling, which drags the used market down with them. A stone bought today will not resell for what you paid.

That is also true of ordinary mined diamonds, where the resale discount is brutal. But it is sharper still on lab grown stones.

What does hold value in a piece of jewellery is the metal. 18 carat gold resells by weight, at a discount. That is not an investment, it is a floor.

So buy a piece of jewellery to wear it. Not to resell it. If the idea is to invest, investment gold and jewellery are two different things, and we would rather tell you before you buy than let you find out ten years later.

What you get for your budget

Concrete markers, taken from our own catalogue.

Around 200 to 300 €. A single coloured stone, small calibre, on a slim band in rhodium plated 925 silver. The colour is there and the piece can be worn daily. It is a real diamond, not an imitation.

Around 1,000 €. A more generous stone, a worked mount, and a choice between silver, vermeil and recycled 18 carat gold depending on the model. This is the heart of the range, where the balance between stone and workmanship is best.

Around 1,500 to 2,000 €. A coloured stone of noticeable calibre, often in a less common cut such as marquise or Asscher. At this level the look genuinely changes, because the visible surface grows.

Above 2,000 €. Longer sequences: tennis bracelets or necklaces with several stones. The price then comes from the number of settings, not from a single stone.

What to take away

The price of a lab grown coloured diamond is set first by saturation, then by evenness, and only after that by weight. Clarity comes last.

Colour costs more than white in a laboratory, because it is harder to produce. That is the reverse of mined diamonds, and it is normal that it throws people.

Finally, the price on a ring mostly tells you which metal you are buying. Compare at equal metal, or you are not comparing anything. To go further, browse our rings set with lab grown diamonds or tell us about your project through our bespoke service.

FAQ

How much does a lab grown coloured diamond cost?

It depends mostly on saturation, not on weight. A small, deeply saturated stone costs more than a large pale one. At Lauredi, a ring set with a coloured lab grown diamond starts at 190 € in rhodium plated 925 silver and rises with the metal and the calibre.

Does a coloured diamond cost more than a white one?

In a laboratory, yes. Achieving a clear, even colour takes extra production steps. With ordinary mined diamonds it is the reverse: a yellowish tint counts as a flaw and pushes the price down.

Which lab grown diamond colour is the most expensive?

Green and pink are the most demanding to grow, yellow is the most accessible. But in a finished ring those production gaps weigh little against the metal and the setting work.

Why do pink diamonds sell for millions at auction?

Because those are natural, mined stones of extreme geological rarity. That market has no connection with lab grown diamonds. The two stones are chemically identical, but their availability is not remotely comparable.

Will lab grown diamond prices keep falling?

That has been the trend for a decade, driven by rising production capacity. Nobody can guarantee what comes next. It is one more reason to buy a piece because you love it, not as an investment.

Can you resell a lab grown diamond?

Only with difficulty, and at a steep discount. The second hand market is narrow and new prices are falling. In a piece of jewellery, what keeps a floor of value is the metal, since 18 carat gold resells by weight.

How do you check that a coloured diamond is certified?

Ask for the gemmological laboratory certificate, IGI in our case. It states the origin of the stone, its colour and its saturation. No consumer tester lets you make that check yourself.

Fiona